Oscillators – Solid state active element oscillator – Transistors
Patent
1992-02-18
1993-03-16
Mis, David
Oscillators
Solid state active element oscillator
Transistors
331143, 331177R, 307497, H03B 524, H03B 3023
Patent
active
051948311
ABSTRACT:
A fully-differential relaxation-type voltage controlled oscillator (VCO) (30) includes an operational transconductance amplifier (OTA) (31) for receiving a differential input voltage. The OTA (31) provides a charging current to a capacitor (33) proportional to the differential input voltage during a first phase of an output signal, and provides a discharging current to the capacitor (33) proportional to the differential input voltage during a secon d phase of the output signal. A comparator having hysteresis (34) detects the charge on the capacitor. A latching portion (35) latches the output of the comparator (34) to provide non-overlapping clock signals.
REFERENCES:
patent: 4742315 (1988-05-01), Schreilechner
"A 30-MHz Low-Jitter High-Linearity CMOS Voltage-Controlled Oscillator", by Wakayama and Abidi, in IEEE Journal of Solid-State Circuits, vol. SC-22, No. 6, Dec. 1987, pp. 1074-1081.
"MOS Oscillators with Multi-Decade Tuning Range and Gigahertz Maximum Speed", by Banu, in IEEE Journal of Solid-State Circuits, vol. 23, No. 6, Dec. 1988, pp. 1386-1393.
Mis David
Motorola Inc.
Polansky Paul J.
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