Abstract: Techniques are provided for the implementation of a signal processing circuit which expands the dynamic range of the signal processing circuit without interrupting the output of the circuit. The techniques can receive an input signal, process the signal through one of a plurality of signal processing circuits, and switch to processing the signal through another of the plurality of signal processing circuits without disturbing the output of the system.

Abstract: Techniques are provided for the implementation of a signal processing circuit (100) which expands the dynamic range of the signal processing circuit (100) without interrupting the output of the circuit. The techniques can receive an input signal (104), process the signal (104) through one of a plurality of dynamically modifiable signal processing circuits, and switch (130) to processing the signal through another of the plurality of signal processing circuits without disturbing the output of the system.

Abstract: A signal processing system (100) comprises an input terminal (102), and a main path having a main filter input gain unit (126) coupled to said input terminal (102), a main filter (132) and an output gain unit (138). An auxiliary path includes an auxiliary filter input gain unit (106) coupled to the input terminal (102), an auxiliary filter (112) and an auxiliary filter output gain unit (118). An adder (144) is coupled to the output gain units (118, 138) for generating an output signal to an output terminal (148). The gains of the gain units are adjusted by a control unit (18) responsive to a detecting signal from a detector (160).

Abstract: A transconductance-setting circuit (10, 20) and method. The circuit (10, 20) includes a first transconductor (14) coupled to a reference voltage (Vref) adapted to produce a current output (Ibias). A reference current source (Iref) is coupled to the first, transconductor (14), and a feedback loop (16) is coupled to the first transconductor (14) and the reference current source (Iref). The feedback loop (16) is adapted to reduce error in the current output (2i) and set the transconductance gm of the first transconductor (14) to a value proportional to the ratio of the reference current and the reference voltage. An auxiliary transconductor (22) is coupleable to the first transconductor (14), and control circuitry (30, 40) is adapted to control the coupling of the auxiliary transconductor (22) to the first transconductor (14) based on the current output (2i).

Abstract: A signal processing system (100) comprises an input terminal (102), and a main path having a main filter input gain unit (126) coupled to said input terminal (102), a main filter (132) and an output gain unit (138). An auxiliary path includes an auxiliary filter input gain unit (106) coupled to the input terminal (102), an auxiliary filter (112) and an auxiliary filter output gain unit (118). An adder (144) is coupled to the output gain units (118, 138) for generating an output signal to an output terminal (148). The gains of the gain units are adjusted by a control unit (18) responsive to a detecting signal from a detector (160).

Abstract: Techniques are provided for the implementation of a signal processing circuit (100) which expands the dynamic range of the signal processing circuit (100) without interrupting the output of the circuit. The techniques can receive an input signal (104), process the signal (104) through one of a plurality of dynamically modifiable signal processing circuits, and switch (130) to processing the signal through another of the plurality of signal processing circuits without disturbing the output of the system.

Abstract: Techniques are provided for the implementation of a signal processing circuit which expands the dynamic range of the signal processing circuit without interrupting the output of the circuit. The techniques can receive an input signal, process the signal through one of a plurality of signal processing circuits, and switch to processing the signal through another of the plurality of signal processing circuits without disturbing the output of the system.

Abstract: A system, method and apparatus are disclosed for common-mode voltage feedback. The preferred system includes a plurality of differential circuits, a corresponding plurality of common-mode voltage detectors, a corresponding plurality of buffer circuits, and a common-mode control circuit. Each differential circuit is operative to produce a first differential output voltage and a second differential output voltage. Each corresponding common-mode voltage detector is operative to provide a common-mode voltage from the first differential output voltage and the second differential output voltage. The common-mode control circuit provides a control voltage signal from the common-mode voltage and from a reference voltage. Each buffer circuit is operative to adjust the corresponding common-mode voltage using the control voltage signal to provide a common-mode feedback voltage signal to the corresponding differential circuit.

Abstract: A system, method and apparatus are disclosed for common-mode voltage feedback. The preferred system includes a plurality of differential circuits, a corresponding plurality of common-mode voltage detectors, a corresponding plurality of buffer circuits, and a common-mode control circuit. Each differential circuit is operative to produce a first differential output voltage and a second differential output voltage. Each corresponding common-mode voltage detector is operative to provide a common-mode voltage from the first differential output voltage and the second differential output voltage. The common-mode control circuit provides a control voltage signal from the common-mode voltage and from a reference voltage. Each buffer circuit is operative to adjust the corresponding common-mode voltage using the control voltage signal to provide a common-mode feedback voltage signal to the corresponding differential circuit.