Electronic device, operating method thereof, and electronic system
An electronic device includes a first sample circuit configured to generate a first sampling signal by sampling an input signal in response to edges of a clock signal, a first comparator configured to generate a first logic decision signal by comparing a voltage level of the first sampling signal with a reference voltage level, an analog bang-bang phase detector configured to generate a first detection signal by executing an exclusive OR (XOR) operation on successive samples of the first logic decision signal, and a digitally controlled oscillator configured to vary a frequency of the clock signal according to the first detection signal.
1. An electronic device comprising:
a first sample circuit configured to generate a first sampling signal by sampling an input signal in response to edges of a clock signal;
a first comparator configured to generate a first logic decision signal by comparing a voltage level of the first sampling signal with a reference voltage level;
an analog bang-bang phase detector configured to generate a first detection signal by executing an exclusive OR (XOR) operation on successive samples of the first logic decision signal; and
a digitally controlled oscillator configured to vary a frequency of the clock signal according to the first detection signal.
2. The electronic device of claim 1 , wherein
the first detection signal includes an up-count voltage level or a down-count voltage level corresponding to thermometer code information, and
the digitally controlled oscillator comprises a capacitor bank configured to store the thermometer code information.
3. The electronic device of claim 1 , further comprising:
a second sample circuit configured to generate a second sampling signal by sampling the input signal in response to edges of an inverted clock signal, the inverted clock signal having a phase opposite to a phase of the clock signal;
a second comparator configured to generate a second logic decision signal by comparing a voltage level of the second sampling signal with the reference voltage level; and
a selector configured to select one of the first logic decision signal and the second logic decision signal in response to a selection signal, wherein
when the first logic decision signal is selected, the analog bang-bang phase detector is configured to generate the first detection signal by executing the XOR operation on the successive samples of the first logic decision signal, and
when the second logic decision signal is selected, the analog bang-bang phase detector is configured to generate the first detection signal by executing the XOR operation on successive samples of the first logic decision signal and successive samples of the second logic decision signal.
4. The electronic device of claim 1 , further comprising:
a phase interpolator configured to generate multi-phase clock signals by adjusting a phase of the clock signal;
a selector configured to select one of the clock signal and the multi-phase clock signals in response to a selection signal; and
a clock divider configured to divide a frequency of the signal selected by the selector and output frequency-divided clock signals.
5. The electronic device of claim 1 , further comprising:
a second sample circuit configured to generate a delayed sampling signal by sampling the first sampling signal;
an analog-to-digital converter configured to convert the delayed sampling signal into a digital signal; and
a digital signal processor configured to generate an output signal by processing the digital signal.
6. The electronic device of claim 5 , further comprising a re-timer configured to generate an aligned detection signal by aligning timing of the first detection signal and provide the aligned detection signal to the digital signal processor,
wherein the digital signal processor comprises a digital loop filter configured to generate a filtered detection signal by low-pass filtering the aligned detection signal and provide the filtered detection signal to the digitally controlled oscillator.
7. The electronic device of claim 6 , wherein
the filtered detection signal has a binary voltage level corresponding to binary code information, and
the digitally controlled oscillator comprises a capacitor bank configured to store the binary code information.
8. The electronic device of claim 6 , further comprising a switch having one end electrically connected to the analog bang-bang phase detector and another end electrically connected to the digitally controlled oscillator, the switch configured to switch an electrical connection between the analog bang-bang phase detector and the digitally controlled oscillator according to an operation mode signal.
9. The electronic device of claim 6 , wherein the digital signal processor further comprises:
an equalizer configured to generate an equalized digital signal by equalizing attenuations of components of the digital signal;
a phase detector configured to detect a phase difference between the equalized digital signal and the digital signal and generate a second detection signal corresponding to the phase difference; and
a selector configured to provide one of the second detection signal and the aligned detection signal to the digital loop filter in response to a selection signal.
10. An operating method of an electronic device comprising an analog bang-bang phase detector, the operating method comprising:
generating a first sampling signal by sampling an input signal in response to edges of a clock signal;
generating a first logic decision signal by comparing a voltage level of the first sampling signal with a reference voltage level;
generating a first detection signal by the analog bang-bang phase detector performing an exclusive OR (XOR) operation on successive samples of the first logic decision signal; and
varying a frequency of the clock signal according to the first detection signal.
11. The operating method of claim 10 , further comprising:
generating a second sampling signal by sampling the input signal in response to edges of an inverted clock signal having a phase opposite to a phase of the clock signal;
generating a second logic decision signal by comparing a voltage level of the second sampling signal with the reference voltage level; and
providing one of the first logic decision signal and the second logic decision signal to the analog bang-bang phase detector in response to a selection signal.
12. The operating method of claim 10 , further comprising:
generating multi-phase clock signals by adjusting a phase of the clock signal; and
generating frequency-divided clock signals by dividing a frequency of any one of the clock signal and the multi-phase clock signals.
13. The operating method of claim 10 , further comprising:
generating a delayed sampling signal by sampling the first sampling signal;
converting the delayed sampling signal into a digital signal; and
generating an output signal by signal processing the digital signal.
14. The operating method of claim 10 , further comprising:
generating an aligned detection signal by aligning timing of the first detection signal; and
generating a filtered detection signal by low-pass filtering the aligned detection signal.
15. The operating method of claim 14 , wherein when an operation mode signal has a dual control mode voltage level corresponding to a dual control mode, the operating method further comprises generating a clock signal having a frequency adjusted according to the first detection signal and the filtered detection signal.
16. The operating method of claim 14 , wherein when an operation mode signal has a single control mode voltage level corresponding to a single control mode, the operating method further comprises generating a clock signal having a frequency adjusted according to the filtered detection signal.
17. An electronic system comprising:
a communication block configured to receive an input signal from a system external to the electronic system; and
a main processor configured to process at least one of arithmetic or logical operations in the electronic system,
wherein the communication block is configured to:
generate a first sampling signal by sampling the input signal in response to edges of a clock signal;
generate a first logic decision signal by comparing a voltage level of the first sampling signal with a reference voltage level;
generate a first detection signal, based on the first logic decision signal; and
generate a clock signal having a frequency adjusted according to the first detection signal.
18. The electronic system of claim 17 , wherein the communication block is configured to:
generate an aligned detection signal by aligning timing of the first detection signal; and
generate a filtered detection signal by low-pass filtering the aligned detection signal.
19. The electronic system of claim 18 , wherein when an operation mode signal received from the main processor has a dual control mode voltage level corresponding to a dual control mode, the communication block is configured to generate a clock signal having a frequency adjusted according to the first detection signal and the filtered detection signal.
20. The electronic system of claim 18 , wherein when an operation mode signal received from the main processor has a single control mode voltage level corresponding to a single control mode, the communication block is configured to generate a clock signal having a frequency adjusted according to the filtered detection signal.