LMH6503MAX Datasheet, PDF (24/33 Pages) Texas Instruments – LMH6503 Wideband, Low Power, Linear Variable Gain Amplifier

LMH6503
SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013
Application Circuits
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FOUR-QUADRANT MULTIPLIER
Applications requiring multiplication, squaring or other non-linear functions can be implemented with four-
quadrant multipliers. The LMH6503 implements a four-quadrant multiplier as illustrated in Figure 69:
Figure 69. Four Quadrant Multiplier
FREQUENCY SHAPING
Frequency shaping and bandwidth extension of the LMH6503 can be accomplished using parallel networks
connected across the R_G ports. The network shown in the Figure 70 schematic will effectively extend the
LMH6503's bandwidth.
Figure 70. Frequency Shaping
2^nd ORDER TUNABLE BANDPASS FILTER
The LMH6503 Variable-Gain Amplifier placed into a feedback loop provides signal processing function such as in
a 2nd order tunable bandpass filter. The center frequency of the 2nd order bandpass shown in Figure 71 is
adjusted through the use of the LMH6503's gain control voltage, V_G. The integrators implemented with two
sections of a LMH6682, provide the coefficients for the transfer function.
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