Phase locked loop with increased phase linearity

Claim 1

AN FM DEMODULATOR COMPRISING: A PHASE LOCKED LOOP HAVING AN OUTPUT VOLTAGE TO INPUT PHASE TRANSFER FUNCTION WITH N REAL ZEROS, N REAL POLES AND P COMPLEX POLES, A LOW-PASS FILTER CONNECTED IN SERIES WITH SAID PHASE LOCKED LOOP, THE OUTPUT VOLTAGE TO INPUT VOLTAGE TRANSFER FUNCTION OF SAID FILTER HAVING Q COMPLEX POLES, WHEREIN P+Q IS AN EVEN NUMBER NO LESS THAN FOUR, AND AN AMPLIFIER IN SERIES WITH SAID FILTER AND SAID PHASE LOCKED LOOP, THE OUTPUT VOLTAGE TO INPUT VOLTAGE TRANSFER FUNCTION OF SAID AMPLIFIER HAVING N REAL POLES AND N REAL ZEROS, EACH OF SAID N REAL POLES IN SAID AMPLIFIER SUBSTANTIALLY EQUALING IN MAGNITUDE A SEPARATE ONE OF SAID N REAL ZONES IN SAID PHASE LOCKED LOOP, AND EACH OF SAID N REAL ZEROS IN SAID AMPLIFIER SUBSTANTIALLY EQUALING A SEPARATE ONE OF SAID N REAL POLES IN SAID PHASE LOCKED LOOP, SAID Q COMPLEX POLES IN SAID FILTER AND SAID P COMPLEX POLES IN SAID LOOP FORMING A SET OF P+P COMPLEX POLES DISTRIBUTED ON THE COMPLEX PLANE AS A GAUSSIAN SET, WHEREBY A SUBSTANTILLY LINEAR PHASE TRANSFER FUNCTION IS PROVIDED FOR SAID DEMODULATOR.