Patent ID: 11895358
Assignee: REALTEK SEMICONDUCTOR CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A signal output circuit having DC gain maintaining mechanism used in an image signal transmission apparatus (TX), comprising:
a front-stage driving circuit comprising a first continuous time linear equalizer (CTLE) having an adjusting capacitor and configured to receive a digital input signal to perform a high frequency enhancement thereon to increase a bandwidth of the digital input signal to generate a front-stage output signal; and
a back-stage driving circuit comprising a second CTLE without the adjusting capacitor and configured to increase a DC gain of the front-stage output signal to compensate a DC gain drop between the front-stage output signal and the digital input signal to generate a back-stage output signal to an image signal receiving apparatus (RX);
wherein a DC gain of each of the front-stage driving circuit and the back-stage driving circuit cancels out each other when a multiplication result of a transconductance and a resistance of a load resistor of each of the front-stage driving circuit and the back-stage driving circuit is far larger than 1.