Patent ID: 7265641

Claim:
A circuit arrangement for generating oscillations with a defined frequency, said circuit arrangement comprising an oscillator circuit ( 30 , 32 ) for generating said oscillations and a dedamping circuit ( 14 , 18 , 20 ) operatively connected to said oscillator circuit ( 30 , 32 ) for dedamping said oscillator circuit, said dedamping circuit comprising a dedamping bridge circuit of field effect transistors ( 22 , 24 , 26 , 28 ) and rectifier circuits ( 60 , 62 ) operatively connected to said bridge circuit and to said oscillator circuit ( 30 , 32 ), wherein said dedamping bridge circuit comprises at least one first bridge branch ( 18 ), including a first pair of MOSFET transistors ( 22 , 24 ) complementary to each other and at least one second bridge branch ( 20 ) including a second pair of MOSFET transistors ( 26 , 28 ) complementary to one another, and wherein each of said rectifier circuits comprises a first rectifier circuit branch ( 60 ) and a second rectifier circuit branch ( 62 ), wherein said first rectifier circuit branch ( 60 ) comprises a first terminal and a second terminal connected to a respective control gate ( 42 , 44 ) of said first pair of MOSFET transistors ( 22 , 24 ), wherein said second rectifier ranch ( 62 ) comprises a third terminal and a fourth terminal connected to a respective control gate ( 36 , 38 ) of said further pair of MOSFET transistors ( 26 , 28 ), said oscillator circuit ( 30 , 32 ) having a first oscillator terminal ( 34 ) connected to said first rectifier circuit branch ( 60 ), said oscillator circuit ( 30 , 32 ) having a second oscillator terminal ( 40 ) connected to said second rectifier circuit branch ( 62 ), whereby said first and second rectifier circuit branches ( 60 , 62 ) control said control gates in closed loop fashion in response to signals at said first and second oscillator terminals ( 34 , 40 ), respectively, and wherein each of said first and second rectifier circuit branches ( 60 , 62 ) comprises a first rectifier diode ( 74 , 86 ) each with a first anode and a first cathode, and a second rectifier diode ( 80 , 88 ) each with a second anode and a second cathode, wherein said first rectifier diode and said second rectifier diode of said first and second rectifier circuit branches ( 60 , 62 ), respectively, are connected in series with each other thereby forming junctions between said first anode and said second cathode of said first and second rectifier circuit branches ( 60 , 62 ), wherein said junctions are connected to a reference potential, and wherein said first cathode and said second anode are connected to a respective control gate terminal ( 42 , 44 ; 36 , 38 ) of said first and second pair of complementary MOSFET transistors ( 22 , 24 ; 26 , 28 ) forming said dedamping bridge circuit ( 18 , 20 ).