US 12,425,048 B1
Transmitter driver circuit
Qing Jiang, Mississauga (CA); Adam Ross Burns, Burlington (CA); Karanbir Singh Chahal, Brampton (CA); and Yunus Ibrahim Dawji, North York (CA)
Assigned to Synopsys, Inc., Sunnyvale, CA (US)
Filed by Synopsys, Inc., Mountain View, CA (US)
Filed on May 15, 2023, as Appl. No. 18/317,838.
Int. Cl. H03M 9/00 (2006.01); H03K 17/687 (2006.01); H03K 17/76 (2006.01); H03K 19/0185 (2006.01)
CPC H03M 9/00 (2013.01) [H03K 17/6872 (2013.01); H03K 17/76 (2013.01); H03K 19/018514 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A transmitter driver circuit, comprising:
a first PMOS device having a gate, a source, and a drain;
a second PMOS device having a gate, a source, and a drain, wherein the source of the second PMOS device is electrically coupled with the source of the first PMOS device;
a first NMOS device having a gate, a source, and a drain;
a second NMOS device having a gate, a source, and a drain, wherein the gate of the first PMOS device is electrically coupled with the gate of the first NMOS device, and the gate of the second PMOS device is electrically coupled with the gate of the second NMOS device, and
a sub-circuit electrically coupled with a voltage domain and the sources of the first and second PMOS devices to provide a voltage lower than the voltage domain to the sources of the first and second PMOS devices, wherein the sub-circuit comprises:
(i) a third PMOS device having a gate, a drain, and a source, wherein the source is electrically coupled with the voltage domain, and the gate is configured to receive a control signal to turn on or off current flow through the source and the drain of the third PMOS device, and a third resistor electrically coupled with the drain of the third PMOS device and the sources of the first and second PMOS devices; or
(ii) a programmable diode array circuit comprising a plurality of programmable diodes in parallel, wherein each of the plurality of programmable diodes is configured to receive a control signal to control impedance of the programmable diode, which in turn controls the voltage provided to the sources of the first and second PMOS devices.