Negative amplifier circuit

A negative amplifier circuit, comprising:

• a first differential pair of transistors;
• and
• a collector capacitance canceling circuit connected between the collectors of said first differential pair, said collector capacitance canceling circuit including a second differential pair of transistors, a voltage-current converting conductance which is formed by connecting an impedance between emitters of said second differential pair, and a buffer circuit made up of a first transistor and a second transistor, said first transistor having its base coupled to the collector of one transistor of said second differential pair and having its emitter coupled to the base of an other transistor of said second differential pair, and said second transistor having its emitter coupled to the base of said one transistor of said second differential pair and having its base coupled to the collector of said other transistor of said second differential pair;
• wherein for each said transistor of said second differential pair the base of said transistor is coupled to the base of said other transistor through said buffer circuit to generate a feedback current and said feedback current makes said conductance appear as a negative impedance to a source connected across the collectors of said second differential pair.