Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1997-12-02
1999-11-23
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330254, H03F 345
Patent
active
059907401
ABSTRACT:
A differential amplifier with adjustable linearity is disclosed herein. The differential amplifier includes a differential pair amplifier and a linearization circuit. The differential pair amplifier receives a differential input voltage and amplifies the differential input voltage to produce an amplified output voltage. The linearization circuit receives the amplified output voltage and generates a compensation signal in response thereto. The compensation signal, which has a magnitude adjustable in response to a linearity adjustment signal, is applied to the differential pair amplifier. The differential pair amplifier uses the compensation signal to apply compensation to the amplification of the differential input voltage. Thus, the linearity of the differential amplifier is adjustable by modifying the linearity adjustment signal. The differential pair amplifier includes a bipolar differential transistor pair having their emitters coupled together to form a common emitter node. A first adjustable current source coupled to the common emitter node provides a gain adjustment signal for adjusting the gain of the differential pair amplifier. The linearization circuit includes a diode element pair having their cathodes coupled together to form a common cathode node. A second adjustable current source coupled to the common cathode node provides the linearity adjustment signal for adjusting the linearity of the differential pair. In another embodiment, the differential pair amplifier includes a differential common-base amplifier.
REFERENCES:
patent: 4514702 (1985-04-01), Zogg
patent: 4779057 (1988-10-01), Woo
patent: 5006818 (1991-04-01), Koyama et al.
patent: 5289136 (1994-02-01), Deveirman et al.
patent: 5329173 (1994-07-01), Murakami et al.
patent: 5331290 (1994-07-01), Harford et al.
patent: 5467057 (1995-11-01), Joardar
patent: 5469106 (1995-11-01), Dow
patent: 5477191 (1995-12-01), DeMicheli
patent: 5508645 (1996-04-01), Castellucci et al.
patent: 5515004 (1996-05-01), Alford et al.
patent: 5528197 (1996-06-01), Frey
patent: 5530444 (1996-06-01), Tice et al.
patent: 5572166 (1996-11-01), Gilbert
patent: 5677646 (1997-10-01), Entrikin
patent: 5818279 (1998-10-01), Dick
Akio Yamamoto, et al., "Wide Bank and Los Supply Voltage ICs for Satellite Tuner Unit", IEEE Transactions on Consumer Electronics, Aug. 1992, pp. 402-408, vol.38, No. 3.
Muhammad I. Ali, et al., "A BiCMOS Low Distortion Tunable OTA for Continuous-Time Filters", IEEE Transactions on Circuits and Systems I:Fundamental Theory and Applications, Jan. 1993, pp. 43-49, vol. 40, No. 1.
Nguyen Khanh Van
Nokia Mobile Phones
Pascal Robert
LandOfFree
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