Four Quadrant Linear Multipliers — Practical Considerations and Applications
Four quadrant linear multipliers are variable gain devices with special properties. Multiplication is a fundamental operation in signal processing but high cost and circuit complexity have, in the past, limited the usefulness of a multiplying element. Like the operational amplifier the multiplier was once mainly used in the specialised field of analogue computation, but again, like the op. amp., the availability of a multiplying module in a low cost integrated circuit form has resulted in its use in an ever widening variety of applications. The product ranges of the manufacturers specialising in circuit modules contain a variety of multiplying devices; we restrict our attention to monolithic multipliers employing the variable transconductance circuit technique discussed in chapter 4.
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