Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
328 words
A phase synchronization circuit comprising: a) a one-shot circuit having two input terminals and one output terminal, for producing a pulse of controlled width from an incoming signal; b) a phase comparison means for comparing a phase relationship between two signals, having two input terminals and two output terminals; c) a charge pump having two input terminals and one output terminal; d) a loop filter; e) a voltage controlled oscillator (VCO) having two input terminals and one output terminal; f) a two-to-one selector circuit, having a first data input terminal coupled to a read data signal, a second data input terminal coupled to a reference clock signal, a control input terminal coupled to a select control signal, and one output terminal, for selecting between a reference clock signal and read data signal; and g) an oscillator control circuit having an input coupled to said one-shot circuit, and further having an oscillator disable signal output; wherein said one-shot output terminal is coupled to a first one of said phase comparison means input terminals, said VCO output is coupled to a second one of said phase comparison means input terminals, said phase comparison output terminals are coupled to said charge pump input terminals, said charge pump output terminal is coupled to said loop filter, a first one of said VCO input terminals and a first one of said one-shot input terminals, said two-to-one selector circuit output terminal is coupled to a second one of said one-shot input terminals, and said oscillator disable signal is coupled to a second one of said VCO input terminals; and wherein said VCO comprises a first ring oscillator further comprising inverters, and an oscillator disable circuit which enables and disables said first ring oscillator as directed by said oscillator disable signal, and said one-shot circuit comprises variable delay means for adjusting pulse width, said variable delay means comprising a second ring oscillator having a frequency that is controlled by the output of said charge pump.
Claim 2
Dependent Claim
328 words
A phase synchronization circuit comprising: a) a one-shot circuit having two input terminals and one output terminal, for producing a pulse of controlled width from an incoming signal; b) a phase comparison means for comparing a phase relationship between two signals, having two input terminals and two output terminals; c) a charge pump having two input terminals and one output terminal; d) a loop filter; e) a voltage controlled oscillator (VCO) having two input terminals and one output terminal; f) a two-to-one selector circuit, having a first data input terminal coupled to a read data signal, a second data input terminal coupled to a reference clock signal, a control input terminal coupled to a select control signal, and one output terminal, for selecting between a reference clock signal and read data signal; and g) an oscillator control circuit having an input coupled to said one-shot circuit, and further having an oscillator disable signal output; wherein said one-shot output terminal is coupled to a first one of said phase comparison means input terminals, said VCO output is coupled to a second one of said phase comparison means input terminals, said phase comparison output terminals are coupled to said charge pump input terminals, said charge pump output terminal is coupled to said loop filter, a first one of said VCO input terminals and a first one of said one-shot input terminals, said two-to-one selector circuit output terminal is coupled to a second one of said one-shot input terminals, and said oscillator disable signal is coupled to a second one of said VCO input terminals; and wherein said VCO comprises a first ring oscillator further comprising inverters, and an oscillator disable circuit which enables and disables said first ring oscillator as directed by said oscillator disable signal, and said one-shot circuit comprises variable delay means for adjusting pulse width, said variable delay means comprising a second ring oscillator having a frequency that is controlled by the output of said charge pump.
Claim 3
Dependent Claim
74 words
The phase synchronization circuit of claim 1, wherein said oscillator disable circuit comprises a voltage fixing switching circuit responsive to said oscillator disable signal; and a transmission circuit, said transmission circuit being disposed between a Kth inverter circuit of said first ring oscillator and a (K+1)th inverter circuit of said first ring oscillator for transmitting signals from the Kth to the (K+1)th inverter, where K is an integer greater than or equal to one.
Claim 4
Dependent Claim
42 words
The phase synchronization circuit of claim 2, wherein said variable delay means has the same circuit configuration as said first ring oscillator and oscillator disable circuit including said transmission circuit, wherein the transmission circuits of said variable delay means are always on.
Claim 5
Dependent Claim
51 words
The phase synchronization circuit of claim 1, wherein said oscillator disable circuit is provided before a first inverter circuit of said ring oscillator and comprises a transmission circuit which transmits signals from a final stage to said first inverter, and a voltage fixing switching circuit responsive to said oscillator disable signal.
Claim 6
Dependent Claim
16 words
The phase synchronization circuit of claim 2, wherein said voltage fixing switching circuit comprises a MOSFET.
Claim 7
Dependent Claim
16 words
The phase synchronization circuit of claim 4, wherein said voltage fixing switching circuit comprises a MOSFET.
Claim 8
Dependent Claim
20 words
The phase synchronization circuit of claim 1, wherein said loop filter comprises a resistor and a capacitor connected in series.