Patent ID: 6107882
Filing Date: 2000-08-22
Classification: H03F

Abstract:
An amplifier having an improved common-mode voltage range, said amplifier having a first input, V.sub.in.sup.+, a second input, V.sub.in.sup.-, and at least one output V.sub.out, said apparatus comprising:a translator for extracting an alternating current (ac) signal riding on a common mode direct current (dc) voltage and translating the extracted signal to ride on a reference direct current (dc) voltage (V.sub.ref), wherein said translator includes at least one N-channel device and at least one P-channel device connected in parallel in such a way that, during operation of said amplifier, at least one of said N-channel device and said P-channel device is enabled,wherein said translator further comprisesan input sensing circuit coupled to at least one of said first and second amplifier inputs, anda correction circuit coupled to said input sensing circuit,wherein said input sensing circuit provides an offset detection signal to said correction circuit and wherein said correction circuit provides a correction signal to said input sensing circuit.