Abstract: A tappet includes a housing with a blind bore and with a shelf groove arranged on the inner wall of the bore; a main body slidably arranged in the bore of the housing, wherein the main body comprises a first shoulder; a secondary body telescopically arranged to the main body and having a second shoulder; a spring device arranged between the first shoulder and the second shoulder; and a locking device extendable from the main body for cooperation with the shelf groove.

Abstract: A tappet includes a housing with a blind bore and with a shelf groove arranged on the inner wall of the bore; a main body slidably arranged in the bore of the housing, wherein the main body comprises a first shoulder; a secondary body telescopically arranged to the main body and having a second shoulder; a spring device arranged between the first shoulder and the second shoulder; and a locking device extendable from the main body for cooperation with the shelf groove.

Abstract: In many types of wireless applications (like wireless modems), it is important that the phase locked loops (PLLs) be able to synthesize clock frequencies in a wide tuning range. Because of the complexity of many conventional PLLs (which were deigned to cover wide tuning ranges), there was often a significant delay to achieve phase and frequency lock. Here, an open loop calibration system is provided to coarse tune a PLL very rapidly. Generally, this calibration system employs binary searches to coarsely adjust a voltage controlled oscillator (VCO) from a VCO bank to within a predetermined range around a target frequency.

Abstract: In many types of wireless applications (like wireless modems), it is important that the phase locked loops (PLLs) be able to synthesize clock frequencies in a wide tuning range. Because of the complexity of many conventional PLLs (which were deigned to cover wide tuning ranges), there was often a significant delay to achieve phase and frequency lock. Here, an open loop calibration system is provided to coarse tune a PLL very rapidly. Generally, this calibration system employs binary searches to coarsely adjust a voltage controlled oscillator (VCO) from a VCO bank to within a predetermined range around a target frequency.

Abstract: An active RC filter (20) includes a first resistive element (23) and a first capacitor array (10/50) which co-acts with the first resistive element (23) to determine a bandwidth characteristic of the programmable active RC filter circuit (20). The total filter capacitance is programmed by switching various first capacitors (4-0, 1, 2 . . . 7) of a first capacitor array (10) in parallel between first and second terminals of the first capacitor array in response to a control word (B0, 1, 2 . . . 7) to determine a first portion of the bandwidth characteristic, and by switching various second capacitors (7-0, 1, 2 . . . 6) of the first capacitor array between the first and second terminals of the first capacitor array in parallel with various ones of the first capacitors (4-0, 1, 2 . . . 7) of the first capacitor array (10) in response to less significant bits (B0, 1, 2 . . . 6) of the control word (B0, 1, 2 . . . 7) to determine a second portion of the bandwidth characteristic.

Abstract: An active RC filter (20) includes a first resistive element (23) and a first capacitor array (10/50) which co-acts with the first resistive element (23) to determine a bandwidth characteristic of the programmable active RC filter circuit (20). The total filter capacitance is programmed by switching various first capacitors (4-0,1,2 . . . 7) of a first capacitor array (10) in parallel between first and second terminals of the first capacitor array in response to a control word (B0,1,2 . . . 7) to determine a first portion of the bandwidth characteristic, and by switching various second capacitors (7-0,1,2 . . . 6) of the first capacitor array between the first and second terminals of the first capacitor array in parallel with various ones of the first capacitors (4-0,1,2 . . . 7) of the first capacitor array (10) in response to less significant bits (B0, 1, 2 . . . 6) of the control word (B0,1,2 . . . 7) to determine a second portion of the bandwidth characteristic.

Abstract: Example biased varactor networks and methods to use the same are disclosed. A disclosed example apparatus includes a bias voltage generator to generate a first bias voltage and a second bias voltage, the second bias voltage selected to be different from the first bias voltage, and a varactor network comprising first and second varactors connected to receive a control voltage, the control voltage configurable to control a capacitance of the varactor network, the capacitance of the varactor network comprising a first capacitance of the first varactor determined by a first difference between the control voltage and the first bias voltage and a second capacitance of the second varactor determined by a second difference between the control voltage and the second bias voltage.