Abstract:
One embodiment of the present invention relates to a digital phase locked loop (ADPLL) configured to generate a plurality of time-aligned output clock signals having different frequency values. The ADPLL comprises a digital controlled oscillator configured to generate a variable clock signal that is separated into two signal paths operating according to two separate clock domains. A first signal path is configured to generate a feedback signal that synchronizes the variable clock signal with a reference signal. A second signal path comprises a clock divider circuit configured to synchronously divide the variable clock signal to automatically generate a plurality of time-aligned output clock signals having different frequencies. A clock aligner monitors a phase difference between the variable clock signal and one of the plurality of time-aligned output clock signals and generates a control signal that causes a programmable delay line to automatically time-align the output clock signals with the variable clock signal.
Abstract:
One embodiment of the present invention relates to a digital phase locked loop (ADPLL) configured to generate a plurality of time-aligned output clock signals having different frequency values. The ADPLL comprises a digital controlled oscillator configured to generate a variable clock signal that is separated into two signal paths operating according to two separate clock domains. A first signal path is configured to generate a feedback signal that synchronizes the variable clock signal with a reference signal. A second signal path comprises a clock divider circuit configured to synchronously divide the variable clock signal to automatically generate a plurality of time-aligned output clock signals having different frequencies. A clock aligner monitors a phase difference between the variable clock signal and one of the plurality of time-aligned output clock signals and generates a control signal that causes a programmable delay line to automatically time-align the output clock signals with the variable clock signal.
Abstract:
In an embodiment, a circuit comprising an oscillator is provided. The oscillator is controlled based on a feedback value and an input reference value. The feedback value or the reference value or both are generated using noise shaping.
Abstract:
A delay stage for a semiconductor device includes at least one delay branch and at least one controllable switching apparatus. The at least one controllable switching apparatus is configured to connect a predefined amount of the at least one delay branch to a supply voltage.
Abstract:
A device for extracting a clock frequency underlying a data stream includes means for controlling a controllable oscillator, coarse-tuning means and fine-tuning means, wherein coarse-tuning means responds to a second data pattern present in the data stream and sets the oscillator coarsely based on its length. Fine-tuning means responds to temporally consecutive first data patterns present in the data stream with a higher accuracy in order to perform a fine tuning of the oscillator on the basis of the temporal length between the two first data patterns and on the basis of the number of clock cycles of the controllable oscillator occurring in this temporal length.
Abstract:
A digitally controllable oscillator includes an oscillation generation means and an oscillator control, wherein the oscillator control comprises two digital/analog converters whose output signals are combined by a combiner in order to generate an analog input signal into the oscillation generation means. The second digital/analog converter is implemented in order to provide, in response to a digital increment in its digital input signal, a difference in the output signal of the second digital/analog converter which is smaller than a difference in the output signal of the first digital/analog converter when the first digital/analog converter is pulsed with the digital increment in its digital input signal.
Abstract:
The disclosed polar modulation transmitter circuit is configured to generate an output signal having a transmission frequency that minimizes crosstalk effects between different transmission bands (e.g., Bluetooth, GSM, UMTS, etc.). In particular, a polar modulation transceiver circuit, having an amplitude modulated (AM) signal and a phase modulated (PM) signal, comprises a digitally controlled oscillator (DCO) configured to generate a DCO signal having a DCO frequency. The DCO signal is provided to one or more frequency dividers that are configured to selectively divide the DCO signal to generate various lower frequency signals, used to select a sampling rate for a DAC operating on the AM signal and an RF carrier signal frequency, which result in an output signal having a frequency that does not interfere with other RF systems on the same IC (e.g., that falls outside of the downlink frequency of other RF systems). Other systems and methods are also disclosed.
Abstract:
The disclosed polar modulation transmitter circuit is configured to generate an output signal having a transmission frequency that minimizes crosstalk effects between different transmission bands (e.g., Bluetooth, GSM, UMTS, etc.). In particular, a polar modulation transceiver circuit, having an amplitude modulated (AM) signal and a phase modulated (PM) signal, comprises a digitally controlled oscillator (DCO) configured to generate a DCO signal having a DCO frequency. The DCO signal is provided to one or more frequency dividers that are configured to selectively divide the DCO signal to generate various lower frequency signals, used to select a sampling rate for a DAC operating on the AM signal and an RF carrier signal frequency, which result in an output signal having a frequency that does not interfere with other RF systems on the same IC (e.g., that falls outside of the downlink frequency of other RF systems). Other systems and methods are also disclosed.
Abstract:
In an embodiment, a circuit comprising an oscillator is provided. The oscillator is controlled based on a feedback value and an input reference value. The feedback value or the reference value or both are generated using noise shaping.