Frequency compensated high frequency amplifiers

A second gain stage for a frequency compensated high frequency amplifier having a first gain stage, the high frequency amplifier being suitable for being manufactured in monolithic integrated circuit form, the second gain stage including in combination:

• a first high impedance node coupled to the first gain stage;
• a second high impedance node;
• a non-inverting amplifier having a first transistor with an emitter electrode, a collector electrode and a base electrode, said base electrode of said first transistor being connected to said first high impedance node, said emitter electrode of said first transistor being coupled to said second high impedance node;
• a first current supply connected to said collector electrode of said first transistor;
• current sink means connected to said emitter electrode of said first transistor;
• a third high impedance node;
• an inverting amplifier having a second transistor with an emitter electrode, a base electrode and a collector electrode, said base electrode of said second transistor being connected to said second high impedance node for receiving signals therefrom and said collector electrode of said second transistor being connected to said third high impedance node, said second transistor thereby being adapted to apply inverted signals to said third high impedance node;
• a second current supply connected to said third high impedance node;
• a pair of complementary output transistors being electrically coupled between said third high impedance node and an output terminal for the high frequency amplifier;
• the impedances at said first, second and third high impedance nodes being a function of frequency and said second high impedance node having a lower impedance at a given frequency than the impedances of said first and third high impedance nodes;
• first frequency compensating capacitive means coupled between said first and third nodes;
• and
• second frequency compensating capacitive means coupled between said output terminal of the high frequency amplifier and said second high impedance node.