Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1998-02-02
2000-05-30
Le, Dinh T.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327 52, 327 65, 327103, H03K 500
Patent
active
060695226
ABSTRACT:
A capacitor current sensing circuitry (100) for sensing the current through a bandpass capacitor (20) of a first biquad stage (80) and generating an output current in response. The capacitor current sensing circuitry (100) includes a differential input circuit comprising a transistor (123) and a transistor (124), a fixed current source (130), a variable current source (120), a variable current, source (122), an input current sink (126), a differential output circuit comprising a transistor (132) and a transistor (134), and a programmable output current sink (138). The differential input circuit receives an input sense voltage and generates a first input current, a second input current, a first output voltage, and a second output voltage in response. The fixed current source (130) generates a current that is used to provide a first current component to the first input current and a first current component to the second input current. The variable current source (120) and the variable current source (122) generate a second component of the first input current and the second input current, respectively. The input current sink (126) receives the first input current and the second input current. The transistor (132) receives the first output voltage and generates a first output current in response, while the transistor (134) receives the second output voltage and generates a second output current in response. The programmable output current sink (138) receives the first output current and the second output current.
REFERENCES:
patent: 5483183 (1996-01-01), Li et al.
patent: 5489872 (1996-02-01), Gopinathan
"Monolithic 10-30 MHz Tunable Bipolar Bessel Lowpass Filter", De Veirman, et al., Paper 7-D.2, IEEE Proc. ISCAS, pp. 1444-1447, 1991, pp. 521-524.
"A 20-MHz Sixth-Order BiCMOS Parasitic-Insensitive Continuous-Time Filter and Second-Order Equalizer Optimized for Disk-Drive Read Channels", Labor, et al., IEEE Journal of Solid-State Circuits, vol. 28, No. 4, Apr. 1993, pp. 462-470.
Pierson Richard C.
Venkatraman Srinivasan
Brady III W. James
Le Dinh T.
Swayze, Jr. W. Daniel
Telecky Jr. Frederick J.
Texas Instruments Incorporated
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