Analog front end of receiver for high baud-rate communications

Analog front end (AFE) circuitry for a communication receiver, the AFE circuitry comprising:

• an input matching network configured to receive a differential input signal;
• a plurality of first buffer amplifiers coupled to the input matching network, each first buffer amplifier comprising a class AB source follower buffer amplifier that includes:
• a first NMOS transistor having a source and a drain,
• a first PMOS transistor having a source coupled to the source of the first NMOS transistor,
• a second NMOS transistor having a source and a drain,
• a second PMOS transistor having a source coupled to the source of the second NMOS transistor,
• a first differential output node between the first NMOS transistor and the first PMOS transistor, the first differential output node connected to the source of the first NMOS transistor,
• a second differential output node between the second NMOS transistor and the second PMOS transistor, the second differential output node connected to the source of the second NMOS transistor,
• first feedback circuitry coupled between the source of the first NMOS transistor and the drain of the second NMOS transistor, and coupled between the source of the second NMOS transistor and the drain of the first NMOS transistor, and
• second feedback circuitry coupled between the source of the first PMOS transistor and a drain of the second PMOS transistor, and coupled between the source of the second PMOS transistor and a drain of the first PMOS transistor;
• a sampler array coupled to the plurality of first buffer amplifiers, the sampler array comprising a plurality of instances of track and hold circuitry, each instance of the track and hold circuitry configured to generate an analog output signal;
• and
• a plurality of second buffer amplifiers coupled to the sampler array, each second buffer amplifier being configured to amplify a respective analog output signal of the sampler array.

Analog front end (AFE) circuitry for a communication receiver, the AFE circuitry comprising:

• an input matching network configured to receive a differential input signal, including:
• a first T-coil circuit,
• a second T-coil circuit,
• a first impedance coupled between the first T-coil circuit and a first input node of the input matching network, the first impedance comprising a first inductor coupled in series between the first T-coil circuit and the first input node of the input matching network, and
• a second impedance coupled between the second T-coil circuit and a second input node of the input matching network, the second impedance comprising a second inductor coupled in series between the second T-coil circuit and the second input node of the input matching network, the first impedance and the second impedance being configured to shift a portion of input loss of the impedance matching network to a frequency above a signaling frequency corresponding to the AFE;
• one or more first buffer amplifiers coupled to the input matching network;
• a sampler array coupled to the one or more first buffer amplifiers, the sampler array comprising a plurality of instances of track and hold circuitry, each instance of the track and hold circuitry configured to generate an analog output signal;
• and
• a plurality of second buffer amplifiers coupled to the sampler array, each second buffer amplifier comprising respective super source follower (SSF) circuitry and being configured to amplify a respective analog output signal of the sampler array.