R.f. transmitter having means for removal of ripple and long term variations of output stage supply

• US 3,283,252 A
• Filed: 12/17/1963
• Issued: 11/01/1966
• Est. Priority Date: 12/17/1963
• Status: Expired due to Term

• Current Assignee: Hansel B. Mead Jr, Hans Scharla-Nielsen
• Original Assignee: Hansel B. Mead Jr, Hans Scharla-Nielsen
• Inventors: Mead, Hansel B. Jr., HANS SCHARLA-NIELSEN
• Application Number:
  US04/331,245
• Time in Patent Office: 1,050 Days
• US Class Current: 455/127.2
• CPC Class Codes: H04B 1/04 Circuits

Claims

1. AN R.F. TRANSMITTER FOR A MODULATED CARRIER COMPRISING AN UNREGULATED D.C. POWER SUPPLY SUBJECT TO RIPPLE AND LONG TIME VARIATIONS, MEANS FOR REGULATING THE VOLTAGE DERIVING FROM SAID SUPPLY, A LOW POWER AMPLIFIER RESPONSIVE TO SAID CARRIER AND ENERGIZED BY THE VOLTAGE DERIVING FROM SAID RGULATING MEANS, A HIGH POWER AMPLIFIER CASCADED WITH SAID LOW POWER AMPLIFIER AND ENERGIZED DIRECTLY BY THE VOLTAGE DERIVING FROM SAID SUPPLY, MEANS RESPONSIVE TO THE SIGNAL LEVEL DERIVING FROM SAID HIGH POWER AMPLIFIER TO CONTROL THE GAIN OF SAID LOW POWER AMPLIFIER TO MAINTAIN THE COMBINED GAIN OF BOTH SAID AMPLIFIERS SUBSTANTIALLY CONSTANT DESPITE LONT TIME VARIATIONS OF THE VOLTAGE DERIVING FROM SAID SUPPLY, AND MEANS FOR SUBSTANTAILLY ELIMINATING THE RIPPLE APPLIED TO SAID HIGH POWER AMPLIFIER, THE LAST NAMED MEANS INCLUDING A CIRCUIT FOR COMPARING RIPPLE IN THE VOLTAGE DERIVING FROM SAID SUPPLY WITH THE RESULTING SHORT TERM FLUCTUATIONS IN THE SUPPLY VOLTAGE AT SAID AMPLIFIER TO DERIVE AN ERROR VOLTAGE THEREFROM, VOLTAGE VARIABLE IMPEDANCE MEANS IN SERIES CIRCUIT WITH SAID POWER SUPPLY AND SAID HIGH POWER