Resistor array circuit device and variable gain device utilizing same
US5523712A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 1995 |
| Grant date | Jun 4, 1996 |
| Priority date | — |
| Expiry date | Mar 6, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/001
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
To provide a resistor array circuit device and variable gain device which make possible precise setting of attenuation factors and the like as well as prevention of generation of gridge noise, a resistor array circuit device has resistors R1.sub.1 to R1.sub.n-1, each with a resistance value R, resistors R2.sub.1 to R2.sub.n, each with a resistance value aR, resistor R3 having a resistance value (l+b)R, switches SW.sub.1 to SW.sub.n for switching connection of resistors R2.sub.1 to R2.sub.n to a terminal T3 or a terminal T4, and a control circuit for controlling switches SW.sub.1 to SW.sub.n so that resistors R2.sub.1 to R2.sub.m-1 on a terminal T1 side of an arbitrary resistor R2.sub.m are connected to terminal T4 and resistors R2.sub.m to R2.sub.n on a terminal T2 side of resistor R2.sub.m are connected to terminal T3, the values of the a and b being determined based on b={-1+(1+4a).sup.1/2 }/2 and 1/2<a/(1+a+b). A variable gain device uses the above resistor array circuit device with an operational amplifier Op and a resistor R4.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.