Full wave amplitude modulation detector circuit

A detector circuit having a pair of differential input terminals for receiving a modulated radio frequency carrier wave signal and an output terminal for providing signal information related to the modulation of said carrier wave and the average value of said carrier wave, said circuit comprising:

• first and second supply terminals connectible to a source of operating power;
• first and second current nodes;
• first and second transistors of one conductibility type having their bases coupled to said differential input terminals, their emitters commonly coupled by way of current supply means to said first supply terminal and their collectors coupled respectively to said first and second nodes;
• third and fourth transistors complementary to said first and second transistors and having their emitters coupled in common to said second supply terminal, their collectors coupled to said first and second nodes respectively, and their bases coupled together;
• fifth and sixth transistors complementary to said first and second transistors and having their emitters coupled in common to said bases of said third and fourth transistors, their collectors coupled to said first supply terminal and their bases coupled respectively to said first and second nodes;
• and
• seventh and eighth transistors complementary to said first and second transistors with their emitters respectively coupled to said first and second nodes, their collectors coupled in common to said output terminal, and their bases coupled in common to a source of operating bias.