Integral-type small signal input circuit
US4578646A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Feb 8, 1984 |
| Grant date | Mar 25, 1986 |
| Priority date | — |
| Expiry date | Feb 8, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06G7/1865
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An integral-type small signal input circuit having a Miller integrator is adapted to perform cyclically an integrating operation, a resetting operation and an input offset current compensating operation. An input offset current compensation circuit which forms a feedback circuit of the amplifier in the Miller integrator is arranged to supply a compensation current to the amplifier for canceling the input offset current during the compensating operation and to supply the held compensation current to the amplifier during the integrating operation. During the compensation period, a low-pass filter which blocks sinusoidal noise components in the input signal is connected to the input of the integrator so that the held compensation current is not affected by the noise components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.