Telecommunications – Receiver or analog modulated signal frequency converter – With particular receiver circuit
Patent
1994-10-18
1995-11-28
Mullins, James B.
Telecommunications
Receiver or analog modulated signal frequency converter
With particular receiver circuit
330259, 455209, H04B 106, H03F 345
Patent
active
054716659
ABSTRACT:
A differential direct current (DC) offset compensation circuit for providing DC offset compensation to a circuit device (110). The DC offset compensation circuit (100) comprises a differential integrator (120) and a summing network (130). The circuit device (110) is one of several types of devices, such as a DC coupled amplifier. The differential input (112) of the circuit device (110) is suitable for coupling to a differential input source (140) and the differential output (114) of the circuit device is suitable for connection to a load (150). The differential integrator (120) features a transconductance amplifier (18) at least one other amplifier (13), and a capacitor element (16) having a capacitance of C1. The summing network (130) sums the differential integrator output with the differential input signals of the differential input source (140) and cancels DC offsets of the differential input source (140) and the circuit device (110).
REFERENCES:
patent: 3731215 (1973-05-01), Peil et al.
patent: 4366443 (1982-12-01), Harford
patent: 5182476 (1993-01-01), Hanna et al.
patent: 5222253 (1993-06-01), Heck
patent: 5241702 (1993-08-01), Dent
Remco J. Wiegerink, Evert Seevinck, Wim De Jager, "Offset Canceling Circuit" Jun. 1989 pp. 651-658, IEEE Journal of Solid-State Circuits vol. 24, No. 3.
Hughes James D.
Pace Gary L.
Floam D. Andrew
Motorola Inc.
Mullins James B.
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