Bob Pospisil is a principal engineer with the Analog Signal Processing Products Group at Intersil Corp., Milpitas, Calif. He received a BSEE from the Florida Institute of Technology, Melbourne. Email address: rpospisi@intersil.com
2 results found for Bob Pospisil, displaying items 1 - 2
September 1, 2006[Ideas For Design] Single-Supply DC Restore Amp Reestablishes Negative Sync
Video systems operating from single +5-V supplies use ac-coupled RGB and composite video signals that operate only within the useful dynamic range of the single-supply amplifiers in the signal chain. For example, if a single +5-V supply rail-to-rail amplifier has a useful dynamic range of down to a few millivolts of ground and up a few millivolts of +5 V, the incoming video signal plus sync must be constrained to that voltage range. Because the NTSC standard composite video...
February 16, 2006[Ideas For Design] Triple Video Mux-Amp Doubles As A/V Source Selector
The increasing number of audio and video sources (VCR, DVD, set-top box, etc.) in a typical home-entertainment system requires a simple way to select the desired source. The add-on mechanical switches available today are bulky and prone to contact wear, resulting in degraded performance over time. Solid-state analog switches solve this problem. But passive switching can produce an annoying thump as ac-coupling capacitors get charged and discharged by the make-and-break action of...
