公开(公告)号：US12289084B2

公开(公告)日：2025-04-29

申请号：US17588662

申请日：2022-01-31

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Masahiro Yoshioka ,  Gabriel Hernandez De La Cruz ,  Lawrence Cotton

IPC: H03F3/45 ,  H03F1/30

Abstract: Examples of amplifier circuitry regulate a transconductance value (Gm) of operational transconductance amplifiers (OTAs) in the amplifier to be approximately the same, which value is based on a supply voltage and a reference voltage applied to a reference OTA and the internal resistance of the reference OTA. The reference OTA generates an output current based on Gm and the reference voltage, which current is compared to current generated by the supply voltage and internal resistance of the reference OTA. A tail current transistor of each of the reference OTA and a main OTA that mirrors the Gm of the reference OTA provide a tail current feedback path by which Gm is regulated. Amplifying circuitry is coupled to the main OTA to receive current signals. Based on the received current signals, amplifying circuitry generates a differential output voltage signal. The gain of the amplifying circuitry is proportional to the supply voltage and remains relatively constant across process temperature variations.

公开(公告)号：US20230246612A1

公开(公告)日：2023-08-03

申请号：US17588662

申请日：2022-01-31

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Masahiro Yoshioka ,  Gabriel Hernandez De La Cruz ,  Lawrence Cotton

IPC: H03F3/45 ,  H03F1/30

CPC classification number: H03F3/45183 ,  H03F1/301

Abstract: Examples of amplifier circuitry regulate a transconductance value (Gm) of operational transconductance amplifiers (OTAs) in the amplifier to be approximately the same, which value is based on a supply voltage and a reference voltage applied to a reference OTA and the internal resistance of the reference OTA. The reference OTA generates an output current based on Gm and the reference voltage, which current is compared to current generated by the supply voltage and internal resistance of the reference OTA. A tail current transistor of each of the reference OTA and a main OTA that mirrors the Gm of the reference OTA provide a tail current feedback path by which Gm is regulated. Amplifying circuitry is coupled to the main OTA to receive current signals. Based on the received current signals, amplifying circuitry generates a differential output voltage signal. The gain of the amplifying circuitry is proportional to the supply voltage and remains relatively constant across process temperature variations.