Patent ID: 8786315

Claim:
A phase frequency detector, comprising: (a) a first signal receiving means including a first input terminal to receive a first input signal and a second input terminal to receive a second input signal; (b) a second signal receiving means cross-coupled said first input terminal to receive said first input signal and said second input terminal to receive said second input signal; (c) a first node connected for charging or discharging depending on the signals received at said input terminals; (d) a second node connected for charging or discharging depending on the signals received at said input terminals; (e) a first control logic circuit for receiving a control signal output by said first node and output a first signal to an output terminal; and (f) a second control logic circuit for receiving a control signal output by said second node and output a second signal to an output terminal; (g) a first feedback means comprising a first feedback transistor for receiving signals from said output terminal of said second control logic circuit; (h) a second feedback means comprising a second feedback transistor for receiving signals from said output terminal of said first control logic circuit, wherein said phase frequency detector comprises no more than 12 transistors.