1
Pak Ho Yeung, Kern Wai Wong, Laurence D Lewicki: Phase locked loop fractional pulse swallowing frequency synthesizer. National Semiconductor Corporation, Brian D Ogonowsky, Skjerven Morrill MacPherson Franklin & Friel, March 30, 1999: US05889436 (70 worldwide citation)

A phase-locked loop (PLL) frequency synthesizer is described which incorporates a fractional pulse swallowing circuit. The fractional pulse swallowing circuit does not add or delete pulses but extends or shortens pulses by a fractional amount. This avoids large phase errors generated by a phase dete ...


2
Kern Wai Wong: PSRR regulator with UVLO. National Semiconductor Corporation, Frommer Lawrence & Haug, Matthew M Gaffney, January 24, 2012: US08102168 (2 worldwide citation)

The invention relates to a regulator with an under-voltage lock-out (UVLO) circuit and a reference generator circuit (e.g., a band-gap reference). The UVLO circuit includes an internal band-gap reference circuit and a comparison circuit. The UVLO circuit compares an input voltage with the output of ...


3
Kern Wai Wong: Differentiator based spread spectrum modulator. Texas Instruments Incorporated, Andrew Viger, Wade J Brady III, Frederick J Telecky Jr, May 27, 2014: US08736324 (1 worldwide citation)

A spread spectrum clock generator which includes a pulse train generator circuit and a modulating circuit configured to produce a modulating signal relating to a time derivative of an output of the pulse train generator circuit. In one embodiment the modulating circuit includes a active differentiat ...


4
Kern Wai Wong: PSRR regulator with output powered reference. National Semiconductor Corporation, Frommer Lawrence & Haug, Matthew M Gaffney, September 28, 2010: US07804284 (1 worldwide citation)

The invention relates to a regulator with a reference generator circuit (e.g., a band-gap reference) and a reference generator power selector. The reference generator power selector selectively powers the reference generator circuit from an input power signal during start-up and from a regulated pow ...


5
Kern Wai Wong: Differentiator based spread spectrum modulator. TEXAS INSTRUMENTS INCORPORATED, Andrew Viger, Frank D Cimino, June 14, 2016: US09369174

A spread spectrum clock generator which includes a pulse train generator circuit and a modulating circuit configured to produce a modulating signal relating to a time derivative of an output of the pulse train generator circuit. In one embodiment the modulating circuit includes a active differentiat ...