High-speed transimpedance amplifier with bandwidth extension feature over full temperature range and bandwidth extension method

A high-speed transimpedance amplifier with bandwidth extension feature over full temperature range, characterized in that, comprising:

• a preamplifier TIA, a phase splitting stage PS, a pre-driver stage Pre-Drive, an output buffer BUFF and an offset cancelation circuit OC;
• said preamplifier TIA comprises an amplifier-A and a transimpedance RF, said transimpedance RF is connected in parallel across an input and an output of said amplifier-A;
• an output terminal TIA_OUT of said preamplifier TIA is connected to a non-inverting input terminal of said phase splitting stage PS;
• a non-inverting output terminal of said phase splitting stage PS is connected to an inverting input of said pre-driver stage Pre-Drive;
• an inverting output terminal of said phase splitting stage PS is connected to a non-inverting input terminal of said pre-driver stage Pre-Drive;
• a non-inverting output terminal of said pre-driver stage Pre-Drive is connected to an inverting input terminal of said output buffer BUFF;
• an inverting output of said pre-driver stage Pre-Drive is connected to a non-inverting input of said output buffer BUFF;
• a non-inverting output terminal of said output buffer BUFF is simultaneously connected to an output pin OP of said transimpedance amplifier and one end of a resistor Ra,
• an inverting output terminal of said output buffer BUFF is simultaneously connected to an output pin ON of said transimpedance amplifier and one end of a resistor Rb,
• another end of said resistor Ra is connected to an inverting input terminal of an offset cancelation circuit OC, another end of said resistor Rb is connected to a non-inverting input terminal of an offset cancelation circuit OC, an output terminal of an offset cancelation circuit OC is connected to an inverting input terminal of the phase splitting stage PS;
• a capacitor C is connected in parallel between said inverting input terminal and said output terminal of said offset cancelation circuit OC;
• said preamplifier TIA adopts a gate-drain voltage cancelation technology to expand its bandwidth, so that its −3 dB bandwidth is greater than twice a closed-loop bandwidth of a first-order TIA, said pre-driver stage Pre-Drive is used to drive the output buffer BUFF, by adjusting a source-level negative feedback capacitance value of said pre-driver stage Pre-Drive circuit to generate high-frequency gain that varies with temperature, compensate the difference in bandwidth of said preamplifier TIA under different temperature conditions.