Browse Prior Art Database

Voltage to Current Converter with Wide Common Mode Range

IP.com Disclosure Number: IPCOM000104255D
Original Publication Date: 1993-Mar-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 1 page(s) / 27K

Publishing Venue

IBM

Related People

Gersbach, JE: AUTHOR [+2]

Abstract

By means of a circuit using two parallel operational amplifiers of complimentary design, common mode analog input signals may be amplified over the entire power supply range.

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Voltage to Current Converter with

Wide

Common

Mode

Range

      By means of a circuit using two parallel operational amplifiers
of complimentary design, common mode analog input signals may be
amplified over the entire power supply range.

      Referring to the figure, the new circuit which amplifies
voltage signals from VIN to current signals at IOUT is comprised of
four principal elements :

1.  A current source comprised of transistors Q12 (P-type), Q13
    (N-type), Q17, Q19, and Q20.
2.  A P-Operational Amplifier comprised of transistors Q1, Q2, Q5,
    Q6, Q7, Q11, Q15, and Q16.
3.  An N-Operational Amplifier comprised of transistors Q3, Q4, Q7,
    Q8, and Q14.
4.  An operational amplifier control circuit comprised of transistors
    Q9, Q10, Q18, Q21, and resistor R0.

Disclosed Anonymously.