Pulse length matched filter

1. A circuit comprising:

a differential amplifier; and,

at least one common mode feedback circuit coupled to the differential amplifier for providing at least a first and second control currents to the differential amplifier for regulating a common mode voltage of the differential amplifier,

wherein the differential amplifier is operable in at least one of at least two modes, such that in a first mode of the at least two modes the differential amplifier is operable to perform integration of a signal, and in a second mode of the at least two modes the differential amplifier is operable to hold at least one sample representative of a previously integrated signal.

2. The circuit of claim 1 , further comprising at least one capacitor and at least one resistor coupled to the differential amplifier for integrating a voltage signal applied to the differential amplifier.

3. The circuit of claim 1 , wherein the differential amplifier includes at least two differential voltage input terminals and at least two differential control voltage terminals.

4. The circuit of claim 1 , wherein the differential amplifier includes at least one capacitor for storing a voltage value representing the result of an integration of a portion of the signal.

5. The circuit of claim 1 , wherein the differential amplifier comprises:

an amplifier portion for amplifying an input signal;

an integration portion for integrating the input signal; and,

a sample and hold portion for sampling and holding at least one voltage value resulting from the integration of the input signal.

6. The circuit of claim 5 , wherein the sample and hold portion includes at least two capacitors for storing voltage values resulting from the integration of the input signal.

7. The circuit of claim 3 , wherein the at least two differential control voltage terminals permit selection of one of the at least two modes.

8. A circuit comprising:

an amplifier portion for amplifying an input signal to produce an amplified input signal;

an integration portion for integrating the amplified input signal to produce an integrated signal; and,

a sample and hold portion for sampling and holding at least one voltage value representing a portion of the integrated signal,

wherein the circuit is operable in at least one of at least two modes associated with at least a first and second control currents, such that in a first mode of the at least two modes the circuit is operable to perform integration of the amplified input signal, and in a second mode of the at least two modes the circuit is operable to hold at least one sample representative of a previously integrated signal.

9. The circuit of claim 8 , wherein the circuit includes at least two differential voltage input terminals and at least two differential control voltage terminals.

10. The circuit of claim 9 , wherein the at least two differential control voltage terminals permit selection of one of the at least two modes.

11. A radar-based sensor system comprising:

a transmitter; and

a receiver, said receiver comprising a differential amplifier and at least one common mode feedback circuit coupled to the differential amplifier for providing at least a first and second control currents to the differential amplifier for regulating a common mode voltage of the differential amplifier, wherein the differential amplifier is operable in at least one of at least two modes, such that in a first mode of the at least two modes the differential amplifier is operable to perform integration of a signal, and in a second mode of the at least two modes the differential amplifier is operable to hold at least one sample representative of a previously integrated signal.