Amplifier

1. A re-circulating amplifier comprising:

a SAW filter with group delay characteristics, said characteristics providing a time delay function; and

a sampling amplifier for sampling an input signal, wherein said input signal passes three times through said further amplifier and SAW filter to provide high net gain.

2. A re-circulating amplifier in accordance with claim 1 , wherein said SAW filter comprises a combination of characteristics including group delay and frequency selectivity simultaneously as part of a sequential amplifier.

3. A re-circulating amplifier in accordance with claim 1 , wherein said input signal passes a plurality of times through said further amplifier and SAW filter to provide high net gain to said input signal.

4. A re-circulating amplifier in accordance with claim 1 , wherein said sampling amplifier is switched in accordance with said delay characteristics of said SAW filter.

5. A re-circulating amplifier comprising:

a SAW filter with group delay characteristics, said characteristics providing a time delay function;

a sampling amplifier for sampling an input signal; and

a further amplifier associated with said SAW filter for re-circulating said input signal, wherein switching waveforms of said sampling amplifier and said further amplifier do not overlap.

6. A receiver comprising a re-circulating amplifier in accordance with claim 1 , wherein said re-circulating amplifier does not comprise a local oscillator or super-regeneration means.

7. A transceiver comprising a re-circulating amplifier in accordance with claim 1 , wherein said re-circulating amplifier does not comprise a local oscillator or super-regeneration means.

8. A re-circulating amplifier in accordance with claim 5 , wherein said SAW filter comprises a combination of characteristics including group delay and frequency selectivity simultaneously as part of a sequential amplifier.

9. A re-circulating amplifier in accordance with claim 5 , wherein said input signal passes a plurality of times through said further amplifier and SAW filter to provide high net gain to said input signal.

10. A re-circulating amplifier in accordance with claim 5 , wherein said sampling amplifier is switched in accordance with said delay characteristics of said SAW filter.

11. A receiver comprising a re-circulating amplifier in accordance with claim 5 , wherein said re-circulating amplifier does not comprise a local oscillator or super-regeneration means.

12. A transceiver comprising a re-circulating amplifier in accordance with claim 5 , wherein said re-circulating amplifier does not comprise a local oscillator or super-regeneration means.