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THS4082 EVM Differential Input
1-13
General
Any of the resistors on the EVM board can be replaced with a resistor of a
different value; however, care must be taken because the surface-mount
solder pads on the board are somewhat fragile and will not survive many
desoldering/soldering operations.
Note:
External factors can significantly affect the effective gain of the EVM. For ex-
ample, connecting test equipment with 50-
Ω
input impedance to the EVM
output will divide the output signal level by a factor of 2 (assuming the output
isolation resistor on the EVM board remains 50
Ω
). Similar effects can occur
at the input, depending upon how the input signal sources are configured.
The gain equations given above assume no signal loss in either the input or
the output.
Frequency compensation capacitors C3 and C6 may need to be installed to
improve stability at lower gains. The appropriate value depends on the
particular application.
The EVM circuit board is an excellent example of proper board layout for
high-speed amplifier designs and can be used as a guide for user application
board layouts.
Summary of Contents for THS4082
Page 1: ...September 2000 Mixed Signal Products User s Guide SLOU075...
Page 4: ...iv...
Page 26: ...1 20 General...
Page 31: ...THS4082 EVM Board Layouts 2 5 Reference Figure 2 3 THS4082 EVM PC Board Layout Component Side...
Page 32: ...THS4082 EVM Board Layouts 2 6 Reference Figure 2 4 THS4082 EVM PC Board Layout Back Side...