Switchless multi-resonant, multi-band power amplifier
The present invention discloses a generic approach to the design of single-path, switchless multi-resonant, multi-band power amplifiers. In the preferred embodiments, the amplifier includes one or more amplification stages, a switchless, multi-resonant, input impedance network, a switchless, multi-resonant, output impedance network, and if multi-stage, a switchless, multi-resonant, interstage impedance network between each amplification stage. Multi-band amplification is accomplished without the need for externally-applied, frequency-indicating control signals. Moreover, the amplifier may be designed to provide concurrent multi-band amplification or non-concurrent amplification.
1. A single-path, multi-band amplifying apparatus for amplifying a signal having a frequency in (any) one of a plurality of predetermined frequency bands, comprising:
(a) first amplifying stage means having a signal input and a signal output, for amplifying the signal; and
(b) switchless, multi-resonant, output impedance network having an input port connected to the signal output of the amplifying stage for providing a predetermined output impedance at any frequency in the one of the plurality of predetermined frequency bands of the signal independent of an externally-applied, frequency-indicating control signal.
2. The amplifying apparatus of claim 1 , further including an input impedance network means having an output port connected to the signal input of the first amplifying stage means.
3. The amplifying apparatus of claim 2 , wherein the input impedance network means comprises switchless, multi-resonant, input impedance network means for providing a predetermined input impedance at each frequency in the one of the plurality of predetermined frequencies of the signal independent of an externally-applied, frequency-indicating control signal.
4. The amplifying apparatus of claim 1 , wherein the amplifying stage means is three-terminal active device means.
5. The amplifying apparatus of claim 4 , wherein the three-terminal active device means is a CMOS transistor.
6. A single-path, multi-band amplifying apparatus for amplifying a signal having a frequency in (any) one of a plurality of predetermined frequency hands, comprising;
(a) amplifying means having a signal input and a signal output, for amplifying the signal; and
(b) switchless, multi-resonant, input impedance network means having an output port connected to the signal input of the amplifying stage for providing a predetermined input impedance at each frequency in the one of the plurality of predetermined frequency bands of the signal independent of an externally-applied, frequency-indicating control signal.
7. A single-path concurrent, multi-band, amplifying apparatus for substantially simultaneously amplifying a plurality of signals each having a frequency within a different one of a plurality of predetermined frequency bands, comprising:
(a) amplifying means having a signal input and a signal output, for amplifying the signals; and
(b) switchless, multi-resonant, output impedance network means having an input port connected to the output of the amplifying stage for providing a predetermined output impedance at the frequency of each of the signals independent of an externally-applied, frequency-indicating control signal.
8. The apparatus of claim 7 , further including an input impedance network.
9. The apparatus of claim 8 , wherein the input impedance network means includes switchless, multi-resonant, input impedance network means having an output port connected to the signal input of the amplifying stage for providing a predetermined input impedance at the frequency of each of the signals independent of an externally-applied, frequency-indicating control signal.