Lock-in test amplifier

Details Lock-in test amplifier Lock-in test amplifier

1987-08-14

1989-07-11

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307244, 307269, 307353, 328105, 328153, 328163, 328167, H03K 1716, H03K 1728

Patent

active

048475238

ABSTRACT:
A lock-in amplifier having an input terminal (E); a pair of signal procesg channels (16, 18) each having an input; and an output (20, 22); a pair of switching devices (S.sub.1, S.sub.2) coupled between the input terminal and the inputs of the signal processing channels; a signal combining circuit (24) having an output and connected between the outputs of the processing channels (16, 18); a switching control circuit (36, 38, 40, 42) having an input (SE) for a synchronizing signal, coupled to the pair of switching devices (S.sub.1, S.sub.2) and includes a pair of delay circuits (36, 40) connected between the synchronizing signal input (SE) and each of the associated switching devices (S.sub.1, S.sub.2). Each of said channels comprises a smoothing and storage network of preferably adjustable time constant.

REFERENCES:
patent: 3602826 (1971-08-01), List et al.
patent: 3681701 (1972-08-01), Maier
patent: 3731188 (1973-05-01), Smith
patent: 4511847 (1985-04-01), Rantala

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