High impedance signal conversion circuit and method

Details High impedance signal conversion circuit and method High impedance signal conversion circuit and method

1997-12-17

1999-11-02

Nelms, David

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365227, 365207, 323315, 324251, G11C 1700

Patent

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059782498

ABSTRACT:
A circuit (200) comprises transistors (240, 250, 260), an operational amplifier (270) and serially coupled resistors (210, 220). The circuit (200) is coupled to reference lines (201, 202). An input voltage V.sub.X on an input terminal (203) is applied across the resistors (210, 220) and divided to an output voltage V.sub.Y on an output terminal (204). Output voltage V.sub.Y is measured (as V.sub.M) by the operational amplifier (270). The operational amplifier (270) controls a current I.sub.A in a first current path between the reference lines (201, 202). The current I.sub.A is mirrored to a current I.sub.S in a second current path through the resistors (210, 220). The current I.sub.S is generated by one of the transistors (260) and substantially proportional to the input voltage V.sub.X. Therefore, the resistors (210, 220) do not substantially load the input and the circuit (200) exhibits a high input impedance.

REFERENCES:
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patent: 5216385 (1993-06-01), McDaniel
patent: 5475342 (1995-12-01), Nakamura et al.
patent: 5525897 (1996-06-01), Smith
patent: 5550469 (1996-08-01), Tanabe et al.
Tietze U., Schenk, Ch.: "Halbleiter-Schaltungstechnik", Zehnte Auflage (10th Edition), Springer Verlag, Berlin, Heidelberg, New York, ISBN 3-540-56184-6, chapter 13.3.3. on pp. 371-378, figure 13.11. Book also available in English (published by Springer in 1991).

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