Phase detecting circuit and clock generating apparatus including the same
View Patent ↗A phase detecting circuit includes a first node that outputs a pull-up control signal, a second node that outputs a pull-down control signal, an initializing unit that initializes voltage levels of the first and second nodes in response to a pre-charge signal, a data input unit to which receives a receiver data, a phase comparison unit that compares a phase of a receiver clock and a phase of the receiver data input to the data input unit to control the voltage levels of the first and second nodes, and a charging/discharging unit that charges or discharges electric charges that are applied to the first and second nodes.
1. A phase detecting circuit comprising:
a first node that outputs a pull-up control signal;
a second node that outputs a pull-down control signal;
an initializing unit that initializes voltage levels of the first and second nodes in response to a pre-charge signal;
a data input unit to which receives a receiver data;
a phase comparison unit that compares a phase of a receiver clock and a phase of the receiver data input to the data input unit to control the voltage levels of the first and second nodes; and
a charging/discharging unit that charges or discharges electric charges that are applied to the first and second nodes.
2. The phase detecting circuit of claim 1 ,
wherein, when the pre-charge signal is enabled, the initializing unit sets the voltage levels of the first and second nodes as a first level.
3. The phase detecting circuit of claim 2 ,
wherein the phase comparison unit decreases the level of the pull-up control signal for every toggle timing of the receiver clock when both the receiver data and the receiver clock are at the first level, and decreases the level of the pull-down control signal for every toggle timing of the receiver clock when the receiver data is at the first level and the receiver clock is at a second level.
4. The phase detecting circuit of claim 3 ,
wherein the receiver clock includes a positive receiver clock and a negative receiver clock, and
the phase comparison unit decreases the voltage level of the first node when the phase difference between the positive receiver clock and the receiver data input to the data input unit is larger than the phase difference between the negative receiver clock and the receiver data, and decreases the voltage level of the second node when the phase difference between the negative receiver clock and the receiver data input to the data input unit is larger than the phase difference between the positive receiver clock and the receiver data.
5. The phase detecting circuit of claim 1 ,
wherein the charging/discharging unit stores the electric charges that are applied to the first and second nodes to control a voltage level change speed of the first node or the second node.
6. The phase detecting circuit of claim 1 , further comprising:
a latch unit that latches the pull-up control signal and the pull-down control signal to generate a pull-up command signal and a pull-down command signal.
7. The phase detecting circuit of claim 6 ,
wherein the pull-up command signal and the pull-down command signal are transmitted to a circuit configuration for controlling a delay line of a DLL (Delay Locked Loop) circuit or a circuit configuration for controlling a charge pump of a PLL (Phase Locked Loop) circuit.
8. The phase detecting circuit of claim 1 , further comprising:
a pulse generator that receives an internal clock to generate the pre-charge signal.
9. A clock generating apparatus comprising:
a receiver that receives an external data to output a receiver data;
a phase detecting circuit that compares a phase of a receiver clock and a phase of the receiver data in response to a pre-charge signal to generate a pull-up command signal and a pull-down command signal;
a shift register that generates a delay control signal in response to the pull-up command signal and the pull-down command signal; and
a delay line that delays and outputs the receiver clock in response to the delay control signal,
wherein the phase detecting circuit includes:
a phase detecting unit that detects the phase of the receiver clock and the phase of the receiver data in response to the pre-charge signal to generate a pull-up control signal and a pull-down control signal; and
a latch unit that latches the pull-up control signal and the pull-down control signal to generate the pull-up command signal and the pull-down command signal,
wherein the phase detecting unit decreases the voltage level of the pull-up control signal for every toggle timing of the receiver clock when both the receiver data and the receiver clock are at a first level, and decreases the voltage level of the pull-down control signal for every toggle timing of the receiver clock when the receiver data is at the first level and the receiver clock is at a second level.
10. The clock generating apparatus of claim 9 ,
wherein the phase detecting unit includes:
a first node that outputs the pull-up control signal;
a second node that outputs the pull-down control signal;
an initializing unit that initializes voltage levels of the first and second nodes in response to the pre-charge signal;
a data input unit to which receives the receiver data;
a phase comparison unit that compares the phase of the receiver clock and the phase of the receiver data that is input to the data input unit to control the voltage levels of the first and second nodes; and
a charging/discharging unit that charges or discharges electric charges that are applied to the first and second nodes.
11. The clock generating apparatus of claim 9 , further comprising:
a pulse generator that receives an internal clock to generate the pre-charge signal.
12. A clock generating apparatus comprising:
a receiver that receives an external data to output a receiver data;
a phase detecting circuit that compares a phase of a receiver clock and a phase of the receiver data in response to a pre-charge signal to generate a pull-up command signal and a pull-down command signal;
a charge pump that performs a charge pumping operation in response to the pull-up command signal and the pull-down command signal to generate a control voltage; and
a voltage control oscillator that oscillates and outputs an output clock in response to the control voltage,
wherein the phase detecting circuit includes:
a phase detecting unit that detects the phase of the receiver clock and the phase of the receiver data in response to the pre-charge signal to generate a pull-up control signal and a pull-down control signal; and
a latch unit that latches the pull-up control signal and the pull-down control signal to generate the pull-up command signal and the pull-down command signal,
wherein the phase detecting unit decreases the voltage level of the pull-up control signal for every toggle timing of the receiver clock when both the receiver data and the receiver clock are at a first level, and decreases the voltage level of the pull-down control signal for every toggle timing of the receiver clock when the receiver data is at the first level, and the receiver clock is at a second level.
13. The clock generating apparatus of claim 12 ,
wherein the phase detecting unit includes:
a first node that outputs the pull-up control signal;
a second node that outputs the pull-down control signal;
an initializing unit that initializes voltage levels of the first and second nodes in response to the pre-charge signal;
a data input unit to which receives the receiver data;
a phase comparison unit that compares the phase of the receiver clock and the phase of the receiver data that is input to the data input unit to control the voltage levels of the first and second nodes; and
a charging/discharging unit that charges or discharges electric charges that are applied to the first and second nodes.
14. The clock generating apparatus of claim 12 , further comprising:
a pulse generator that receives an internal clock to generate the pre-charge signal.