US 11,736,138 B2
Digital upconverter for radio frequency sampling transmitter
Sriram Murali, Bengaluru (IN); Jaiganesh Balakrishnan, Bengaluru (IN); Pooja Sundar, Bengaluru (IN); Harshavardhan Adepu, Warangal (IN); Wenjing Lu, Shanghai (CN); and Yeswanth Guntupalli, Guntur (IN)
Assigned to Texas Instruments Incorporated, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Oct. 5, 2021, as Appl. No. 17/493,943.
Application 17/493,943 is a continuation of application No. 17/072,104, filed on Oct. 16, 2020, granted, now 11,171,681.
Claims priority of application No. 201941042297 (IN), filed on Oct. 18, 2019.
Prior Publication US 2022/0029657 A1, Jan. 27, 2022
Int. Cl. H04B 1/40 (2015.01); H04B 1/00 (2006.01)
CPC H04B 1/40 (2013.01) [H04B 1/0075 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system, comprising:
a conjugate-mixer-combiner comprising:
a pre-combiner configured to generate:
a first sum of a first in phase (I) value at a first frequency and a second I value at a second frequency;
a first difference of the first I value at the first frequency and the second I value at the second frequency;
a second sum of a first quadrature (Q) value at the first frequency and a second Q value at the second frequency; and
a second difference of the first Q value at the first frequency and the second Q value at the second frequency; and
shared multipliers coupled to the pre-combiner, the shared multipliers configured to shift the first sum to produce a first shifted sum, the second sum to produce a second shifted sum, the first difference to produce a first shifted difference, and the second difference to produce a second shifted difference.