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Broadband biasing of microwave circuits for 0.5 to 18 GHz can be accomplished with decreased insertion loss by adding a resistor and capacitor to ground from the junction of a pair of series inductors.
English (United States)
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Wideband Bias Network
Broadband biasing of microwave circuits for 0.5 to 18 GHz can be
accomplished with decreased insertion loss by adding a resistor and capacitor to
ground from the junction of a pair of series inductors.
Referring to the figure, a 50-ohm transmission line 1 on which the variable
frequency signal is applied is connected to a DC biasing source at terminal 2 and
blocking capacitor 3 through respective seven and five turn coils 4 and 5. A
resistor 6 is added in series with another blocking capacitor 7 to ground at the
junction at the two coils. The usual insertion loss of such a circuit is reduced by
adjusting the value of the resistor. The stray capacitance 8 should be minimized,
since it will cause another resonance to appear at about 3 GHz if it is too large.
The number of turns of coil 4 could be increased were it not for the
transmission line nature of the inductor. However, the coil becomes a quarter
wavelength long in the band and, accordingly, has a large insertion loss in the
middle of the band. The addition of resistor 6 spoils the resonance that occurs at
about 10 GHz. Thus, the insertion loss is reduced at 0.5 GHz. This is due to the
coil being twice as long as would be possible without the resistor. The insertion
loss is prevented from rising at 10 GHz as a consequence of the longer coil, by
spoiling the Q of the resonance with the resistor.
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