Abstract:
An alternative phase detector without the need for direct phase measurement is provided. The phase detector comprises three signal inputs (S1, S2, S3), a ratio determination circuit (RDC) for determining at least two ratios of the respective input signals, and a calculation circuit (CC) to derive a measure of a phase difference between at least two input signals.
Abstract:
An amplifier circuit with improved accuracy is provided that comprises a cascade of amplifier stages, a control line for controlling the amplifier stages, a feedback circuit having an input port for receiving a reference signal, and a feedback loop connecting the feedback circuit to the control line. Via the feedback circuit and the feedback loop, the large signal behavior of the amplifier stage is accurately fixed. As a result, the small signal gain of the amplifier stages has an improved accuracy as well.
Abstract:
An alternative phase detector without the need for direct phase measurement is provided. The phase detector comprises three signal inputs (S1, S2, S3), a ratio determination circuit (RDC) for determining at least two ratios of the respective input signals, and a calculation circuit (CC) to derive a measure of a phase difference between at least two input signals.
Abstract:
An impedance measurement system (IMS) is provided that comprises an RSSI chain (RSSI), a limiter RSSI chain (LIMRSSI) and a limiter chain (LIM). The RSSI chain and the limiter RSSI chain are connected to a subtraction circuit (SC) and the limiter RSSI chain and the limiter chain are connected to a phase detector (PD). Further, a mobile communication device is provided that comprises the impedance measurement system in an adaptive impedance control system.
Abstract:
An amplifier circuit with improved accuracy is provided that comprises a cascade of amplifier stages, a control line for controlling the amplifier stages, a feedback circuit having an input port for receiving a reference signal, and a feedback loop connecting the feedback circuit to the control line. Via the feedback circuit and the feedback loop, the large signal behavior of the amplifier stage is accurately fixed. As a result, the small signal gain of the amplifier stages has an improved accuracy as well.