CMOS buffer amplifier

A CMOS voltage buffer amplifier comprising:

• a differential pair of input transistors including a first field effect transistors (M11) and a second field effect transistor (M12);
• an active load connected to said first and second field effect transistors comprising a third field effect transistor (M111) connected to said first field effect transistor, and a fourth field effect transistor (M112) connected to said second field effect transistor;
• a current strip circuit comprising a fifth field effect transistor (M131) connected to said first field effect transistor, and
• a sixth field effect transistor (M130) connected to said second field effect transistor, and
• a second differential stage comprising seventh and eighth field effect transistors (M117, M115) connected to be driven respectively said first and second transistors (M11, M12), are a biasing current for the second differential stage varies in accordance with the current flowing through the current strip circuit.

An imaging system comprising:

• input image optics;
• a detector connected to said optics;
• an analog signal processor connected to said detector for processing received signals and including a plurality of switched capacitor circuits;
• an output display responsive to said signal processor;
• and a CMOS voltage buffer amplifier connected to provide a voltage reference for said switched capacitor circuits, said CMOS voltage buffer amplifier comprising:
• an input pair of field effect transistors;
• an active load connected with said transistors;
• a current strip circuit connected with said input pair of transistors for providing a path for a major portion of current flowing through said input pair of transistors;
• and
• output means connected with said active load.

A CMOS voltage buffer amplifier comprising:

• an input defined as a differential pair of field effect transistors;
• an active load connected with said transistors;
• a current strip circuit in series with the input and in parallel with the active load, the strip circuit providing a path for a substantial portion of current flowing through said input;
• a second stage differential amplifier connected to be driven by said active load, where current flowing through the second stage varies in accordance with current flowing through the strip circuit;
• an output terminal for said amplifier;
• and
• a current boost circuit connected between said second stage and said output terminal, said second stage being connected to said output terminal.