Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1997-05-19
2000-02-22
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330253, H03F 345
Patent
active
060284803
ABSTRACT:
In a differential pair (P1, P2) actively loaded with a current mirror (N1, N2), a differential amplifier (A) drives the common terminal (Z) of the current mirror to force a zero voltage difference between the input terminal (X) and the output terminal (Y) of the current mirror. The voltage at the input terminal (X) is actively bootstrapped, via the differential amplifier (A), by the voltage of the output terminal (Y) with high precision. Thus a high voltage gain is obtained. A capacitor (CP) between the input terminal (X) and the control terminal (Z) compensates the local loop formed by the differential amplifier (A) and the input transistor (N1) of the current mirror, and forms a short circuit at high frequencies, thus reducing the active load of the differential pair to a conventional current mirror. For high frequencies the circuit has the same gain and phase properties as the standard non-bootstrapped approach and standard compensating techniques can be applied to the complete amplifier.
REFERENCES:
patent: 4068184 (1978-01-01), Ahmed
patent: 4360785 (1982-11-01), Schade, Jr.
patent: 4568885 (1986-02-01), McKenzie et al.
patent: 4768619 (1988-09-01), Taylor
patent: 4992755 (1991-02-01), Seevinck et al.
patent: 5351011 (1994-09-01), Seevinck et al.
patent: 5373248 (1994-12-01), Fernandez
patent: 5694084 (1997-12-01), Sakurai
Du Plessis Monuko
Seevinck Evert
Biren Steven R.
Nguyen Khanh Van
Pascal Robert
U.S. Philips Corporation
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