Title:
DIFFERENTIAL CHARGE PUMP PHASE LOCK LOOP (PLL) SYNTHESIZER WITH ADJUSTABLE TUNING VOLTAGE RANGE
Document Type and Number:
WIPO Patent Application WO2005004331
Kind Code:
A3
Abstract:
A differential charge pump PLL synthesizer with adjustable tuning voltage range including a voltage controlled oscillator responsive to a tuning voltage to provide an output frequency. A phase detector circuit is responsive to a reference frequency and the submultiple of the output frequency for generating up and down pulses. A differential charge pump is responsive to the up and down pulses for generating positive and negative differential current pulses. A loop filter is responsive to the positive and negative differential current pulses for providing a differential voltage. A differential amplifier circuit is responsive to the differential voltage and a shift voltage applied at a voltage terminal for shifting the output voltage range of the differential amplifier circuit to provide a predetermined tuning voltage range.
Inventors:
KEAVENEY MICHAEL F (IE)
TUTHILL MICHAEL (IE)
TUTHILL MICHAEL (IE)
Application Number:
PCT/US2004/020509
Publication Date:
October 20, 2005
Filing Date:
June 25, 2004
Export Citation:
Assignee:
ANALOG DEVICES INC (US)
KEAVENEY MICHAEL F (IE)
TUTHILL MICHAEL (IE)
KEAVENEY MICHAEL F (IE)
TUTHILL MICHAEL (IE)
International Classes:
H03D13/00; H03K3/017; H03K3/0231; H03L7/00; H03L7/06; F04B; H02M; H03L; H04B; (IPC1-7): H03L7/00
Foreign References:
| US4959618A | 1990-09-25 | |||
| US6466070B1 | 2002-10-15 | |||
| US5740213A | 1998-04-14 | |||
| US5121085A | 1992-06-09 | |||
| US4389621A | 1983-06-21 |
Download PDF:
Previous Patent: OSCILLATOR AND TRANSMISSION/RECEPTION DEVICE
Next Patent: IMPROVED CHARGE PUMP SYSTEM FOR FAST LOCKING PHASE LOCK LOOP
Next Patent: IMPROVED CHARGE PUMP SYSTEM FOR FAST LOCKING PHASE LOCK LOOP