51
Bo Hedberg, Peter Petersson: Step controlled signal generator. Telefonaktiebolaget L M Ericsson, Burns Doane Swecker & Mathis, December 6, 1994: US05371480 (11 worldwide citation)

A phase locked loop frequency synthesizer in which the output frequency is changed in a series of steps in order to reach a final frequency value. The steps are computed and stored in a memory in a control unit. The steps are chosen to approximately cancel the poles of the transfer function of the s ...


52
Takashi Matsuura, Yukio Fukumura: Phase-locked loop frequency synthesizer having reduced power consumption. NEC Corporation, Ostrolenk Faber Gerb & Soffen, May 19, 1987: US04667169 (11 worldwide citation)

In an improved phase-locked loop frequency synthesizer, a voltage is continuously applied from a power source to a fixed divider and a programmable divider respectively composed of such lower electric power consuming means as C-MOS circuitry such that the fixed and programmable dividers preserve the ...


53
Jesse S LeGrand: High speed phase locked loop frequency synthesizer. International Telephone and Telegraph Corporation, John T O Halloran, Alfred C Hill, September 15, 1981: US04290028 (11 worldwide citation)

A phase locked looped type frequency synthesizer utilizing a source of a reference signal comprising a voltage controlled oscillator and a phase detector which receives the reference signal and compares that to the output signal of the voltage control oscillator after suitable division by a programm ...


54
Johannes Wilhelmus Theodorus Eikenbroek: Method and system of jitter compensation. Telefonaktiebolaget L M Ericsson, Roger S Burleigh, March 15, 2011: US07907016 (11 worldwide citation)

A phase locked loop frequency synthesizer with jitter compensation having a tapped delay line for compensating the jitter prior to passing a signal subject to jitter through a non-linearity; and, a ΣΔ modulator for generating, or a storing element for pre-generated storing, of a fractional pattern r ...


55
Heck Joseph Paul: Two-part synthesizer modulation system using a reference phase modulator.. Motorola, January 28, 1987: EP0209754-A2 (11 worldwide citation)

An improved frequency modulator arrangement for use in a phase-locked loop frequency synthesizer is disclosed which provides high deviation, low distortion, FM signals from a wide range of modulating signals such as digital data or low frequency tone modulation. This arrangement advantageously injec ...


56
Andrew R Adams, Stephen C Avery: Offset mode phase locked loop frequency synthesizer with reduced divide ratio. Cisco Technology, Dov Rosenfeld, Inventek, July 20, 2004: US06765977 (11 worldwide citation)

A phase locked loop (PLL) frequency synthesizer includes a voltage controlled oscillator (VCO) to provide a VCO frequency signal, a frequency offset circuit including a mixer accepting the VCO frequency signal and a signal from a second oscillator to produce a shifted-frequency signal having a frequ ...


57
Stephen T Janesch, Eric J King: Digital frequency locked loop and phase locked loop frequency synthesizer. RF Micro Devices, Withrow & Terranova PLLC, October 9, 2007: US07279988 (10 worldwide citation)

A frequency synthesizer including frequency and phase locked loop that operates in either a frequency locked loop (FLL) mode or a phase locked loop (PLL) mode. In a first state, the frequency and phase locked loop operates in the FLL mode for initial frequency acquisition. Once the frequency and pha ...


58
Peter W Pflasterer: Multiband scanning radio receiver using frequency synthesizer. Masco Corporation of Indiana, Leon E Redman, December 18, 1979: US04179662 (10 worldwide citation)

A scanning FM monitor receiver is disclosed which is of the superheterodyne type and is capable of scanning and receiving a plurality of channels on a plurality of bands. The receiver incorporates a phase-locked-loop frequency synthesizer which eliminates the need for crystals for every channel. The ...


59
Paul R Marshall: Low power phase locked loop frequency synthesizer. Koninklijke Philips Electronics, Aaron Waxler, September 21, 2004: US06795517 (10 worldwide citation)

A phase locked loop frequency (PLL) synthesizer in which the scaled output of a reference oscillator(


60
Behrooz L Abdi, David M Gonzalez, Alex W Hietala: Switching current mirror for a phase locked loop frequency synthesizer and communication device using same. Motorola, John G Rauch, February 24, 1998: US05722052 (9 worldwide citation)

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 con ...