Abstract: An amplifier circuit (10) having a rotating input stage has a switching network (12) connected to an input (14). A number of parallel transconductance gain stages (16) are connected to the switching network (12). An auto-zeroing circuit (18) is connected to the switching network (12). A second transconductance gain stage (20) is connected to the parallel transconductance gain stages (16).

Abstract: A power stealing circuit to charge a capacitor includes a passive electrical power channel. The passive electrical power channel has an input connected to an input signal and an output designed to be connected to the capacitor. An active electrical power channel is powered by the capacitor. The active electrical power channel has an input connected to the input signal and an output connected to the capacitor.

Abstract: A low-corner frequency high pass filter circuit (10) includes an operational amplifier (12). The operational amplifier (12) has an inverting input (14) and a non-inverting input (24). A series capacitor (26) has a first end connected to the non-inverting input (24) of the operational amplifier (12). A second end of the series capacitor (26) is connected to an input signal (28). A low gain amplifier (30) has an input connected to an output (22) of the operational amplifier (12) and has an output (32) connected to the non-inverting input (24) of the operational amplifier (12). The low gain amplifier (30) performs the function of large value resistor.

Abstract: A parasitically compensated resistor (50) for integrated circuits includes a substrate (52). A polysilicon resistor (54) is formed in the substrate (52). The polysilicon resistor (54) has a first end connected to a first lead (56) and a second end connected to a second lead (58). A conductive layer (62) is capacitively connected to the polysilicon resistor (54).

Abstract: An amplifier circuit (10) having a rotating input stage has a switching network (12) connected to an input (14). A number of parallel transconductance gain stages (16) are connected to the switching network (12). An auto-zeroing circuit (18) is connected to the switching network (12). A second transconductance gain stage (20) is connected to the parallel transconductance gain stages (16).

Abstract: An amplifier circuit (20) for a photodetector includes a transconductance variable gain stage (32). The transconductance variable gain stage (32) has an input (34) capable of connecting to the photodetector and an output (40). A transconductance gain stage (44) has an input (42) connected to the output (40) of the transconductance variable gain stage (32). A feedback resistor (46) is connected between an output (48) of the transconductance gain stage (44) and the input (42) of the transconductance gain stage (44).