Transconductance amplifier circuit
US4091333A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 25, 1977 |
| Grant date | May 23, 1978 |
| Priority date | — |
| Expiry date | Jul 25, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/347
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A transconductance amplifier circuit including two operational amplifiers, as shown in the accompanying drawing, is disclosed. The gain of the amplifier circuit is determined by the resistances R1, R2, R3 and R4. The scale factor relating the output current i.sub.out to the input voltage e.sub.in is determined by the setting of the switches S1, S2, and S3, which adjust the amount of resistance between the output current terminal I.sub.o and the output terminal of the second operational amplifier A2. For R1/R2 = 1; R3/R4 = 1; and switch S1 closed i.sub.out = e.sub.in /R5. This transconductance amplifier circuit provides common mode rejection between the input voltage and the output current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.