Circuit arrangement for low-noise fully differential...

Details Circuit arrangement for low-noise fully differential... Circuit arrangement for low-noise fully differential...

2005-07-19

2005-07-19

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S257000, C330S260000

Reexamination Certificate

active

06919767

ABSTRACT:
The invention relates to a circuit for low noise, fully differential amplification. A feedback signal (121) is detected in a differential output step of the differential amplification circuit by means of a voltage distributor formed by a first feedback resistance (119) and a second feedback resistance (120). A first output signal (111) is provided at a first output circuit node (117) and a second output signal (112) is provided at a second output circuit node (118). The respective first and second output signals (111) or (112) form a full output signal which corresponds to an input signal formed by a first and a second input signal (101) or (102). A load current (134), an input current (132) and a reference current (132) are established by means of a load current source (128), an input current source (131) and a reference current source (127). A matching transistor (301) is used to adjust an adaptation between the load current source (128), the input current source (131) and the reference current source (127). A feedback signal (121) of the differential amplification circuit is compared with a reference voltage (122) in a reference step, and the load current (134) is mirrored in the differential input step, in a current mirror device.

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patent: 6753732 (2004-06-01), Moreland
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Banu, Mihai et al., “Fully Differential Operational Amplifiers with Accurate Output Balancing”,IEEE Journal of Solid-State Circuits, vol. 23, No. 6, pp. 1410-1414; 1998.
Claessen, von Ulrich et al., “Erhöhte Genauigkeit bei der Simulation analoger CMOS-Schaltungen durch ein verbessertes MOS-Kompaktmodell”,Archiv fur Elktronik und Ubertragungstechnik, vol. 44, No. 2, pp. 139-147; 1990.
Luh, Louis et al., “A Continuous-Time Common-Mode Feedback Circuit (CMFB) for High-Impedance Current-Mode Applications”,IEEE Transactions on Circuits and Systems, vol. 47, No. 4, pp. 363-369; 2000.
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