Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular error voltage control
Patent
1999-04-30
2000-07-25
Mis, David
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular error voltage control
331 23, 327 56, 327 57, 455208, 455260, 360 30, 360 51, 329325, H03L 7107, H03D 300
Patent
active
060941022
ABSTRACT:
A frequency stabilizer circuit in the form of a charge-pump phase-lock loop utilizing a MEMS capacitance device, preferably a tunable MEMS capacitor or a MEMS capacitor bank, which more rapid and with a greater precision determine the phase and frequency of a carrier signal so that it can be extracted, providing an information signal of interest. Such MEMS devices have the added advantage of providing linear capacitance, low insertion losses, higher isolation and high reliability, they run on low power and permit the entire circuit to be fabricated on a common substrate. The use of the MEMS capacitance device reduces unwanted harmonics generated by the circuit's charge pump allowing the filtering requirements to be relaxed or perhaps eliminated.
REFERENCES:
patent: 5880921 (1999-03-01), Tham et al.
patent: 5959516 (1999-09-01), Chang et al.
Cheng T. Wang, editor, "Inroduction to Semiconductor Technology: GaAs and Related Compounds", John Wiley & Sons, Inc., pp. 187-195 and 422-423, (1990).
Darrin J. Young et al, Solid-State Sensor and Actuator Workshop, Hilton Head, South Carolina, "A Micromachined Variable Capacitor for Monolithic Low-Noise VCOS", pp. 86-89, (Jun. 2-6, 1996).
Bartlett James L.
Chang Mau Chung F.
Marcy, 5th Henry O.
Mehrotra Deepak
Pedrotti Kenneth D.
Mis David
Rockwell Science Center LLC
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