Telecommunications – Transmitter and receiver at same station – With frequency stabilization
Patent
1996-02-28
1998-02-24
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at same station
With frequency stabilization
455260, 327157, 330253, H04B 140, H03F 345
Patent
active
057220522
ABSTRACT:
A communication device (100) employs a local oscillator (104) having an improved charge pump circuit (122). The charge pump circuit (122) has current mirrors (204, 208) in which a first transistor (224, 270) is biased to provide a substantially constant current. A resistor (226, 272) selectively conducts a reference current to bias a mirror transistor (228, 274). The current mirror (204, 208) provides improved dynamic performance thereby reducing global phase error of the communication device (100).
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Groenveld et al., "A Self-Calibration Technique for Monolithic High-Resolution D/A Converters", IEEE Journal of Solid-State Circuits, vol. 24, No. 6, Dec. 1989, pp. 1517-1522.
Abdi Behrooz L.
Gonzalez David M.
Hietala Alex W.
Bhattacharya Sam
Eisenzopf Reinhard J.
Motorola Inc.
Rauch John G.
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