Abstract: Methods and apparatus to lock a phase lock loop to a spindle motor are disclosed. An example controller comprises a counter to determine a period of an operating signal received from a motor, an oscillator to generate a control signal based on an input signal, and an initializer to generate the input value based on the period, wherein the input value causes the oscillator to generate the control signal having the same phase as the operating signal.

Abstract: An averaging circuit includes: input signal nodes for providing input signals 330; a multiplexing circuit 320 coupled to the input signal nodes for switching between the input signals 330 to create a time waveform; a low pass filter 300 coupled to an output 340 of the multiplexing circuit 320 for filtering the time waveform to create an average signal; and an average replication circuit 310 coupled to an output 350 of the low pass filter 300.

Abstract: A segmented digital-to-analog converter includes: upper segments 200, 210, and 220; a thermometer decoder 400; a randomizing circuit 410 coupled between the thermometer decoder 400 and the upper segments 200, 210, and 220 for randomizing an output of the thermometer decoder 400; a divider location selector circuit 420 coupled between the randomizing circuit 410 and the upper segments 200, 210, and 220 for choosing a selected segment from the upper segments 200, 210, and 220; and lower segments 225 coupled to the selected segment.

Abstract: An averaging circuit includes: input signal nodes for providing input signals 330; a multiplexing circuit 320 coupled to the input signal nodes for switching between the input signals 330 to create a time waveform; a low pass filter 300 coupled to an output 340 of the multiplexing circuit 320 for filtering the time waveform to create an average signal; and an average replication circuit 310 coupled to an output 350 of the low pass filter 300.

Abstract: A segmented digital-to-analog converter includes: upper segments 200, 210, and 220; a thermometer decoder 400; a randomizing circuit 410 coupled between the thermometer decoder 400 and the upper segments 200, 210, and 220 for randomizing an output of the thermometer decoder 400; a divider location selector circuit 420 coupled between the randomizing circuit 410 and the upper segments 200, 210, and 220 for choosing a selected segment from the upper segments 200, 210, and 220; and lower segments 225 coupled to the selected segment.

Abstract: A differential switching circuit includes: a first inverter 46; a first pull-up transistor 43 coupled between the first inverter 46 and a high-side power supply node; a first pull-down transistor 34 coupled between the first inverter 46 and a low-side power supply node; an output node of the first inverter 46 coupled to a control node of the first pull-up transistor 43 and a control node of the first pull-down transistor 34; a second inverter 47; a second pull-up transistor 45 coupled between the second inverter 47 and the high-side power supply node; a second pull-down transistor 36 coupled between the second inverter 47 and the low-side power supply node; and an output node of the second inverter 47 coupled to a control node of the second pull-up transistor 45 and a control node of the second pull-down transistor 36, wherein the first and second inverters 46 and 47 are coupled together between the inverters and the pull-up transistors 43 and 45, and between the inverters and the pull-down transistors 34 and

Abstract: A skewless differential switching circuit uses skewless switching elements to convert complementary signals with skew into complementary output signals with minimal time skew between the output signals and with equalized rise and fall times of the output signals for minimum harmonic distortion.