US 12,451,840 B2
Transformer-coupled input buffer for frequency synthesis
Sonam Sadhukhan, Santa Clara, CA (US); Arpan Thakkar, Bangalore (IN); and Pranav Kumar, Bangalore (IN)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by Texas Instruments Incorporated, Dallas, TX (US)
Filed on Feb. 29, 2024, as Appl. No. 18/591,255.
Claims priority of provisional application 63/610,522, filed on Dec. 15, 2023.
Prior Publication US 2025/0202427 A1, Jun. 19, 2025
Int. Cl. H03B 5/12 (2006.01); G06F 1/08 (2006.01); H03K 17/60 (2006.01)
CPC H03B 5/1212 (2013.01) [G06F 1/08 (2013.01); H03K 17/60 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A frequency synthesis circuit, comprising:
a first transistor having a first terminal, a second terminal, and a control terminal;
a second transistor having a first terminal, a second terminal, and a control terminal;
a first inductor having a first terminal, and having a second terminal coupled to the first terminal of the first transistor;
a first capacitor having a first terminal coupled to the first terminal of the first inductor and having a second terminal coupled to the first terminal of the first transistor;
a second inductor having a first terminal, and having a second terminal coupled to the first terminal of the second transistor;
a second capacitor having a first terminal coupled to the first terminal of the second inductor and having a second terminal coupled to the first terminal of the second transistor;
a third inductor coupled between a first input and the control terminal of the first transistor;
a fourth inductor coupled between a second input and the control terminal of the second transistor; and
an injection-locked oscillator having a first input coupled to the first terminal of the second transistor, and a second input coupled to the first terminal of the first transistor.