Abstract: A linear regulator circuit to regulate an output voltage includes a first current path to conduct a first current, a feedback path to provide feedback to maintain the output voltage at a constant voltage, and a transistor positioned in the first current path to provide the output voltage.

Abstract: A circuit is designed with a register circuit (70) arranged to store a control word. A voltage-controlled oscillator (73) is coupled to receive the control word (72) and produce a clock signal (76) having a current frequency corresponding to the control word. A phase detector circuit (53) is coupled to receive a reference signal (52) and the clock signal. The clock signal has one of a phase lead and a phase lag with respect to the reference signal. The phase detector circuit produces a phase signal (58) having a first state in response to the phase lead and having a second state in response to the phase lag. An estimate circuit (69) is coupled to the register circuit and the phase detector circuit. The estimate circuit produces a next control word (71) corresponding to a next frequency intermediate the current frequency and a frequency corresponding to a transition between the first and second states.

Abstract: A linear regulator circuit to regulate an output voltage includes a first current path to conduct a first current, a feedback path to provide feedback to maintain the output voltage at a constant voltage, and a transistor positioned in the first current path to provide the output voltage.

Abstract: An electronic system, such as a video decoder (80), includes a clock generator circuit (22, 22′) based upon a phase-locked loop (PLL) (25). The PLL (25) includes a voltage controlled oscillator (VCO) (30) that produces a plurality of evenly-spaced output phases, each of a locked frequency relative to a reference clock (CREF). A frequency synthesis circuit (27) receives a frequency selection value on control lines (FREQ) that include an integer and a fraction portion. The integer and fraction portion of the frequency selection value are added to the current contents of a register (40) that stores the previous integer value used to select the corresponding phase from VCO (30) for application to the clock input of a toggle flip-flop (36) from which the output clock (COUT) is generated. Use of the fraction portion permits a time-averaged clock frequency to be produced with more precision than the multiple phases output by the VCO (30).

Abstract: An apparatus for producing a clock signal includes a recirculating delay-locked loop operable to receive a reference clock signal, produce an output clock signal, and adjust the relative phase, with respect to the reference clock signal, of the output clock signal to align the output clock signal with the reference clock signal. The apparatus also includes a phase filter that is operable to receive the output clock signal and filter any phase shift of the output clock signal over a plurality of cycles of the output clock to produce an adjusted output clock signal.

Abstract: An emitter-coupled logic to CMOS logic converter includes a first current mirror having a first transistor that has a terminal. The first current mirror is operable to mirror a current in the terminal of the first transistor to produce a mirrored first current. The converter also includes a first current sink operable to generate a first current in the terminal of the first transistor. The converter also includes a second current mirror having a second transistor that has a terminal. The second current mirror is operable to mirror a current in the terminal of the second transistor to produce a mirrored second current. The converter further includes a second current sink operable to generate a second current in the terminal of the second transistor and a differential input pair operable to receive a differential voltage input and direct a current, based on the differential voltage input, to the terminal of the first transistor or the terminal of the second transistor.

Abstract: A ring oscillator includes a plurality of inverting delay elements connected in a ring. Each inverting delay element includes an inverter having an output node. The oscillator also includes a programmable current circuit operable to rob a variable amount of current from the output node of the inverter to control the duration of a delay period associated with the delay element.