H - Electricity – 03 – F
Patent
H - Electricity
03
F
328/166, 330/21
H03F 3/45 (2006.01) G01R 13/22 (2006.01) H03F 3/26 (2006.01)
Patent
CA 1252523
Abstract A level shift circuit for shifting the common mode level of the output signal provided by a differ- ential amplifier has first and second input terminals for receiving the output signal from the differential amplifier, which has a Thevenin source impedance Rs, and also has first and second output terminals that are connected to a reference voltage level through a load impedance R0. The circuit comprises a differen- tial transconductance amplifier having two output terminals that are connected respectively to the first and second output terminals of the circuit. The amplifier has the property that it responds to an input voltage Ee between its input terminals by pro- viding a current equal to Eegm1/(1+?s) (where gm1 is the transconductance of the amplifier, ? is the response time constant of the amplifier and s is the Laplace transform operator) at its output terminals. Two equal-valued capacitors are connected respectively between the first input terminal of the circuit and the first output terminal of the circuit and between the second input terminal of the circuit and the second output terminal of the circuit, the capacitance Cc of each capacitor being such that RsCc is much greater than ?. The circuit also comprises two equal- valued resistors connected in series between the first input terminal of the circuit and the second output terminal of the circuit and having their connection point connected to one of the input terminals of the amplifier, and two more equal-valued resistors con nected in series between the first output terminal of the circuit and the second input terminal of the cir- cuit and having their connection point connected to the other of the two input terminals of the amplifier. The value of gm1 is selected to be equal to (1/2Rs + 1/R).
547110
Diller Calvin D.
Gladden Donald D.
Kirby Eades Gale Baker
Tektronix Inc.
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