Modulators inventions 07/09

20090189707 - Wideband quadrature imbalance compensation system and method: Compensating for wideband quadrature imbalance error by introducing inverse complex inputs to phase quadrature estimator filters to generate estimated quadrature distortion; summing estimator quadrature distortion with a delayed version of the actual complex input to obtain estimated quadrature output; comparing the output with the true output to obtain residual quadrature... Agent: Kenyon & Kenyon LLP

20090179709 - Signal modulation scheme in class-d amplification and circuit therefor: A class-D amplifier (10) includes a logic circuit (40) for controlling the operation of a switching bridge (11). The logic circuit (40) transmits the differential mode of a differential pulse width modulation input signal and deletes a central portion of the common mode of input signal, while preserving pulses of... Agent: Paul, Hastings, Janofsky & Walker LLP

20090174494 - Pulse generation circuit and modulator: It is an object of the invention to provide a pulse generation circuit and a modulator for realizing a high On/Off ratio in a small circuit scale and with lower power consumption. A short pulse generation circuit according to the invention includes an oscillator 101, a control signal generation circuit... Agent: Pearne & Gordon LLP

20090174495 - Contactless ic card system: In a contactless IC card system, a modulating circuit manufactured in an IC form is operable at a high power efficiency. The demodulating apparatus is configured to include: first signal output means for outputting a first output signal having a predetermined phase with respect to that of an input signal,... Agent: K&l Gates LLP