Inter-Stage Matching Network to Enhance Common Mode Stability

An amplifier comprising:

• a. a first stage having
• i. a first transistor, and
• ii. a second transistor;
• b. a second stage having
• i. a third transistor, and
• ii. a fourth transistor;
• c. a first transformation network having a first ground and a second ground;
• and
• d. a second transformation network having a third ground and a fourth ground,
• wherein
• a collector of said first transistor is operatively connected to a base of said third transistor by said first transformation network,
• a collector of said second transistor is operatively connected to a base of said fourth transistor by said second transformation network,
• said first ground and said third ground are operatively connected to each other,
• said second ground and said fourth ground are operatively connected to each other,
• an emitter of said first transistor and an emitter of said second transistor are operatively connected to said first ground and said third ground,
• said first ground, said second ground, said third ground and said fourth ground are electrically connected to one another, and
• said second ground and said fourth ground are electrically connected to an emitter of said third transistor and an emitter of said fourth transistor by at least one resistor.

An amplifier comprising:

• a. a first stage having
• i. a first plurality of transistors connected in parallel with one another, and
• ii. a second plurality of transistors connected in parallel with one another,
• wherein each emitter of said first plurality of transistors are operatively connected to each emitter of said second plurality of transistors;
• b. a second stage having
• i. a third plurality of transistors connected in parallel with one another, and
• ii. a fourth plurality of transistor connected in parallel with one another;
• wherein each emitter of said third plurality of transistors are operatively connected to each emitter of said fourth plurality of transistors;
• c. a first transformation network having a first ground and a second ground;
• and
• d. a second transformation network having a third ground and a fourth ground,
• wherein
• each collector of said first plurality of transistors are operatively connected to each base of said third plurality of transistors by said first transformation network,
• each collector of said second plurality of transistors are operatively connected to each base of said fourth plurality of transistors by said second transformation network,
• said first ground and said third ground are operatively connected to each emitter of said first plurality of transistors and each emitter of said second plurality of transistors,
• said second ground and said fourth ground are operatively connected to each emitter of said third plurality of transistors and each emitter of said fourth plurality of transistors, and
• said first, said second, said third and said fourth grounds each being electrically connected to one another.

An amplifier comprising:

• a. a first stage having
• i. at least one first transistor, and
• ii. at least one second transistor;
• b. a second stage having
• i. at least one third transistor, and
• ii. at least one fourth transistor;
• c. a first transformation network having a first ground and a second ground;
• and
• d. a second transformation network having a third ground and a fourth ground,
• wherein
• a collector of said at least one first transistor is operatively connected to a base of said at least one third transistor by said first transformation network,
• a collector of said at least one second transistor is operatively connected to a base of said at least one fourth transistor by said second transformation network,
• said first ground, said third ground, an emitter of said at least one first transistor and an emitter of said at least one second transistor are electrically connected to each other,
• said second ground, said fourth ground, an emitter of said at least one third transistor and an emitter of said at least one fourth transistor are electrically connected to each other, and
• said first and said third grounds are electrically connected to said second and said fourth grounds.