Method and apparatus for driving a direct current or voltage controlled oscillator with modulation slope feedback
Granted: November 25, 2004
Application Number:
20040233009
A d.c. signal controlled oscillator includes a frequency-determining network having a control input and a modulation input. A phase regulating loop includes the oscillator and components that provide a control signal to the control input. A circuit apparatus for driving the oscillator includes a modulation generator that provides a modulation signal to the modulation input, and a circuit arrangement that autonomously generates a signal depending on and representing a slope of the…
Apparatus and method for a configurable mirror fast sense amplifier
Granted: September 9, 2004
Application Number:
20040174746
A configurable mirror sense amplifier system for flash memory having the following features. A power source generates a reference voltage. A plurality of transistors is biased at the reference voltage. The plurality of transistors is each coupled to a second transistor. Each of the plurality of transistors is also configured to provide a current for comparison with the flash memory. The reference voltage is internal, stable and independent from variations of a power supply or…
Circuit arrangement for signal detection having current mirror with cascode coupled transistors
Granted: August 12, 2004
Application Number:
20040155753
A circuit arrangement for detecting a received signal includes a rectifier with an input connected to a receiving antenna for rectifying an encoded received signal, a signal capacitor connected to an output of the rectifier, a discharge current sink connected to the signal capacitor, and a signal evaluating circuit connected to the signal capacitor. The discharge current sink includes a current mirror circuit of cascode-connected transistors. Thereby, the discharge current is…
Circuit arrangement and method for deriving electrical power from an electromagnetic field
Granted: August 12, 2004
Application Number:
20040155754
A circuit arrangement for deriving electrical power from a received electromagnetic field to power a transponder includes a detuning unit connected between two antenna terminals for limiting the power absorbed by the antenna. The detuning unit includes a component having an impedance that passively varies or is actively varied dependent on the field strength of the field prevailing at the antenna. One arrangement of the detuning unit includes two varactor diodes connected anti-parallel…
Receiving/backscattering arrangement and method with two modulation modes for wireless data transmission as well as modulation arrangement therefor
Granted: July 29, 2004
Application Number:
20040145452
For transmitting data, a receiving/backscattering arrangement receives, modulates and reflects or backscatters electromagnetic waves emitted by a base station. The modulation corresponds to the data to be transmitted and is carried out selectively using first and/or second different modulation methods depending on the received field strength of the received electromagnetic waves. Preferably, phase shift keying is used especially or at least at low field strengths at far range, while…
High frequency power detector with dBm-linear characteristic and method of regulating the power of an electrical HF-oscillation
Granted: July 15, 2004
Application Number:
20040135628
A high frequency power detector includes an input coupling arrangement that couples an electrical HF-oscillation into a basic circuit portion including at least a first diode and a circuit node. The power detector further includes a series circuit of a resistor and a second diode connected to the circuit node, as well as a voltage tapping arrangement for detecting or tapping the voltage drop across the second diode as an output signal. The voltage at the circuit node includes a DC…
Fast dynamic low-voltage current mirror with compensated error
Granted: March 25, 2004
Application Number:
20040056708
A current mirror comprises a current source; a first n-channel MOS transistor having a drain and a gate coupled to the current source and a source coupled to a source potential; a second n-channel MOS transistor having a drain, a gate coupled, to the drain and gate of the first n-channel MOS transistor, and a source coupled to the source potential; and a zero-threshold-voltage MOS transistor having a source coupled to the drain of the second n-channel MOS transistor, a gate coupled to…
Negative charge pump with bulk biasing
Granted: March 25, 2004
Application Number:
20040057259
An n-channel MOS transistor negative-voltage charge pump is disclosed in which the bulks of the n-channel MOS transistors are biased in such a manner as to prevent turning on the parasitic bipolar transistor inherent in the CMOS environment of the charge pump structure.
System for controlling the stand-by to active and active to stand-by transitions of a VCC regulator for a flash memory device
Granted: March 18, 2004
Application Number:
20040052145
A voltage down-converter system, with a stand-by mode and an active mode, for a memory device with the following components. A charge node is configured to receive a charge. A first transistor has a first gate and the first transistor is configured to supply a load current to the memory device. A first switch is coupled to the charge node and the first gate, the first switch being configured to apply the charge in the charge node to the first gate during transition from stand-by to…
Temperature-compensated current reference circuit
Granted: March 18, 2004
Application Number:
20040051580
A circuit comprises an amplifier having first output node comprising a first n-channel MOS transistor and a second output node comprising a second n-channel MOS transistor. A first p-channel MOS transistor is coupled to a supply potential, and the second output node. A first PNP bipolar transistor is coupled to the first p-channel MOS transistor through a first resistor and to the second n-channel MOS transistor and to ground. A second PNP bipolar transistor is coupled to the first…
Fast dynamic mirror sense amplifier with separate comparison equalization and evaluation paths
Granted: March 18, 2004
Application Number:
20040051564
A memory cell sensing circuit to sense data from a memory cell includes a reference memory cell coupled to pass a reference current. A sense amplifier has a first input and a second input coupled to a bias circuit of the data memory cell. A first mirror mirrors the reference current to a voltage coupled to the first input of the sense amplifier. A second mirror mirrors the reference current to a voltage coupled to the bias circuit of the data memory cell. A third mirror mirrors the…
DAC-BASED VOLTAGE REGULATOR FOR FLASH MEMORY ARRAY
Granted: March 11, 2004
Application Number:
20040046681
A DAC-based voltage regulator system for a non-volatile memory device comprises a charge pump circuit having an enable input and a voltage output node. A voltage-to-current converter has an input coupled to the voltage output node and an output coupled to a virtual ground node. A current source is coupled to the virtual ground node and sinks one of a plurality of currents in response to states of a plurality of digital input signals. A transconductance amplifier has an inverting input at…
Reference voltage source, temperature sensor, temperature threshold detector, chip and corresponding system
Granted: February 26, 2004
Application Number:
20040036460
The invention relates to an electrical reference voltage source comprising:
Circuit and method for providing an output current with a prescribed temperature coefficient
Granted: November 20, 2003
Application Number:
20030214277
A circuit includes two internal current sources or sinks coupled together by a coupling element, which may be a direct junction as a summing element or a current mirror as a subtracting element. In an associated method, the currents of the two internal current sinks or sources are summed or subtracted by the coupling element to form an output current. The magnitudes and/or temperature coefficients of the two internal currents differ from one another. The temperature coefficient of the…
Oscillating circuit with reduced decay and transient times
Granted: November 6, 2003
Application Number:
20030206069
A circuit arrangement for reducing the decay and build-up transient times of an intermittently operating oscillating circuit increases the data transmission rate of a transmission unit using such an oscillating circuit. A control unit is connected to the oscillating circuit including a capacitor, a coil, and a resistor. A switch element controlled by the control unit selectively connects a voltage source to the capacitor, or selectively connects a current source to the coil. In the…
Method of transmitting data with optimized transmission rate using packet header that defines data encoding parameters
Granted: July 17, 2003
Application Number:
20030133435
For transmitting data between a base station and a transponder, information packets modulated onto an electromagnetic carrier wave each include a header section, a middle section, and an end section. The data are encoded in the middle section using information symbols, e.g. representing digital “1s” and “0s”. The header section of at least the first packet defines the number and unique identifications of all of the symbols that will be used for encoding the data…
Method of detecting a redirection or relaying of a contactless data transmission using at least two sequentially driven transmitting antennas
Granted: June 26, 2003
Application Number:
20030119453
A method detects relaying of a contactless data communication by a radio amplifier for intercepting and manipulating the communication to achieve an unauthorized authentication. The method involves transmitting an electromagnetic field successively from at least two spatially separated antennas of a transmitting unit, receiving the transmitted fields in a receiving unit, determining field strength vectors of the received fields allocated to each antenna, and comparing actual values of…
Integrated receiving/backscattering arrangement for contactless data transmission
Granted: June 5, 2003
Application Number:
20030102961
A receiving/backscattering arrangement for carrying out a contactless data transmission includes an integrated circuit having two antenna contacts, a series arrangement of three high quality capacitances connected between the two antenna contacts, whereby the middle capacitance is an MOS varactor, a controllable variable voltage source connected across the MOS varactor, and a control unit that controls the voltage source. The receiving/backscattering arrangement is especially a passive…
Method and circuit for obtaining field strength information
Granted: June 5, 2003
Application Number:
20030104795
A receiving unit including an operational amplifier having a fixed gain receives an electromagnetic signal, from which a voltage divider with a variable resistance generates an input voltage for the amplifier. The amplifier's output voltage is compared with a reference voltage. The variable input resistance is adjusted to vary the amplifier's input voltage, until the amplifier's output voltage lies within a defined range around the reference voltage. This adjusted resistance value is…
DCDC voltage converter overload detector, and corresponding component and device
Granted: May 22, 2003
Application Number:
20030094968
The invention concerns a detector of overloads for DCDC converters, the said converter supplying a load current with an output voltage (Vout) that may be different from a supply voltage (Vbat), by means of an inductance (L) and a first transistor (TPO), made conductive or blocked by regulation devices depending on the quantity of current demanded by the said load, the said detector having a means of capturing an image of the said load current at a predetermined smaller scale, and also a…
