Db-linear variable gain amplifier (vga) stage with a high broad band
An operational amplifier and wide bandwidth technology, which is applied in the direction of gain control, amplification control, and control of components of the amplification device, etc., and can solve problems such as increasing circuit complexity
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[0062] figure 1 Shown is the basic structure of a VGA stage including signal feeders. The amplified signal is transmitted via a cable H (coaxial cable or twisted pair) by a drive circuit (transmitter) 3 . At the interface between the transmitter / cable and the cable / receiver, respective transformers 4, 5 are given. The structure of the VGA stage 1 of the receiver is a fully differential structure, and has the same circuit part for the positive half-wave and the negative half-wave of the input signal respectively.
[0063] The VGA stage shown is capable of highly linearly amplifying or attenuating differential input signals fluctuating between, for example, 20 mV to 2 V, respectively, with a wide dynamic range and wide bandwidth and is capable of providing a substantially constant amplitude differential output at the differential output terminals VOUTP and VOUTN Signal.
[0064] By means of terminating resistors, the transmission cable H can be terminated non-reflectively. ...
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