US 11,675,046 B2
Transmitter unit suitable for millimeter wave devices
See Taur Lee, Allen, TX (US); and Sher Jiung Fang, Allen, TX (US)
Assigned to GlobalFoundries U.S. Inc., Santa Clara, CA (US)
Filed by GLOBALFOUNDRIES INC., Grand Cayman (KY)
Filed on Aug. 31, 2019, as Appl. No. 16/558,095.
Prior Publication US 2021/0063531 A1, Mar. 4, 2021
Int. Cl. G01S 7/35 (2006.01); H03K 5/00 (2006.01); H03F 3/24 (2006.01); G01S 7/282 (2006.01)
CPC G01S 7/35 (2013.01) [G01S 7/282 (2013.01); H03F 3/245 (2013.01); H03K 5/00006 (2013.01); H03F 2200/451 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A semiconductor device, comprising:
a transmitter, comprising:
a first circuit configured to receive a differential input signal having a first frequency and provide a differential modulated signal having the first frequency and a first clock phase, the first circuit comprising:
an injection-locked ring oscillator configured to generate a plurality of phase shifts; and
a switching circuit configured to select the first clock phase from the plurality of phase shifts;
a second circuit comprising one or more frequency multipliers, wherein the one or more frequency multipliers is configured to receive the differential modulated signal and provide a differential second signal having a second frequency greater than the first frequency and having a second clock phase; and
an output transformer configured to receive the differential second signal and transform the differential second signal to a single-ended output signal.