A phase modulation apparatus is provided whereby excellent RF phase modulation signals can be obtained even when the modulation sensitivity of a voltage controlled oscillator varies. Phase modulation apparatus 100 has: phase detector 105 that performs phase detection with respect to an RF phase modulation...http://www.google.com/patents/US7215215?utm_source=gb-gplus-sharePatent US7215215 - Phase modulation apparatus, polar modulation transmission apparatus, wireless transmission apparatus and wireless communication apparatus
