Synchronous detector
US3955105A · kind A · utility
1Cited by
3References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 19, 1974 |
| Grant date | May 4, 1976 |
| Priority date | — |
| Expiry date | Jul 19, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J1/36
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A synchronous detector circuit provides a direct current output as a function of an alternating current input signal. Direct current and noise level in the input is removed in a circuit including filters and an operational amplifier and a parallel path feedback network, including in one branch a semiconductor and in a second branch a load and switching circuit synchronously operating with the alternating current input signal. The switching circuit may include a field-effect transistor switch made operative by a semiconductor switching off and on as a function of synchronously chopped light received by a photosemiconductor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.