MIPI C-PHY v1.2 D-PHY v2.1 TX 3 trios/4 Lanes in TSMC (16nm, N7, N5A)
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PWM sigma-delta modulator
The PWM sigma-delta modulator is a special type of 1-bit sigma-delta modulator that produces a pulse width modulated (PWM) output signal with a fixed repetition frequency. A fixed repetition frequency makes the output signal insensitive to typical problems associated with (continuous time) sigma-delta converters, such as non-linear inter symbol interference (ISI) and kickback noise on the reference of the DAC.
The PWM sigma-delta modulator implements a digital PWM sigma-delta modulator consisting of a fifth-order loop filter, followed by a 16 taps moving average filter, a sawtooth carrier injection (with a frequency of fCLK/16) and a 1-bit quantizer.
The PWM sigma-delta modulator implements a digital PWM sigma-delta modulator consisting of a fifth-order loop filter, followed by a 16 taps moving average filter, a sawtooth carrier injection (with a frequency of fCLK/16) and a 1-bit quantizer.
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Block Diagram of the PWM sigma-delta modulator
