October 2012
Intermediate to advanced
860 pages
23h 37m
English
Content preview from RF Circuit Design, 2nd Edition
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Chapter 13: Speciality of “Zero if” System
13.1 Why Differential Pair?
13.1.1 Superficial Difference between Single-Ended and Differential Pair
In the early years of electronic circuit development, only single-ended stages were studied and implemented. Gradually, it was found that some special features of performance could be achieved only by a differential pair instead of a single-ended stage or a double-balanced mixer. At present, both single-ended and differential pairs have been developed for most RF blocks, such as the LNA (low-noise amplifier), mixer, VCO (voltage-controlled oscillator), filter, and PA (power amplifier). In the recent years, a number of differential circuits have appeared in RF or RFIC designs, especially in “zero IF” or direct conversion communication systems.
Without the input and output impedance matching networks, a single-ended stage is shown in Figure 13.1, and a differential pair is shown in Figure 13.2.
Figure 13.1 Typical single-ended block. (a) Bipolar single-ended stage. (b) MOSFET single-ended block.
Figure 13.2 Typical differential pair. (a) Bipolar differential pair. (b) MOSFET differential pair.
The differential pair appears as two single-ended blocks joined together with a common emitter or source resistor, Re or Rs, in a bipolar or a MOSFET ...
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