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LT1720 Datasheet(PDF) 21 Page - Linear Technology |
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LT1720 Datasheet(HTML) 21 Page - Linear Technology |
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21 / 28 page  21 LT1720/LT1721 APPLICATIONS INFORMATION and 100 µV/°C baseline uncertainty. Switching delay is less than 15ns and the minimum sampling window width for full power response is 30ns. The input waveform is presented to the diode bridge switch, the output of which feeds the LT1227 wideband amplifier. The LT1720 comparators, triggered by the sample command, generate phase-opposed outputs. These sig- nals are level shifted by the transistors, providing comple- mentary bipolar drive to switch the bridge. A skew compensation trim ensures bridge-drive signal simulta- neity within 1ns. The AC balance corrects for parasitic capacitive bridge imbalances. A DC balance adjustment trims bridge offset. The trim sequence involves grounding the input via 50 Ω and applying a 100kHz sample command. The DC balance is adjusted for minimal bridge ON vs OFF variation at the output. The skew compensation and AC balance adjust- ments are then optimized for minimum AC disturbance in the output. Finally, unground the input and the circuit is ready for use. Voltage-Controlled Clock Skew Generator It is sometimes necessary to generate pairs of identical clock signals that are phase skewed in time. Further, it is desirable to be able to set the amount of time skew via a tuning voltage. Figure 18’s circuit does this by utilizing the LT1720 to digitize phase information from a varactor- tuned time domain bridge. A 0V to 2V control signal provides ≈±10ns of output skew. This circuit operates from a 2.7V to 6V supply. 1720/21 F18 – + C2 1/2 LT1720 VCC 2.7V TO 6V VCC Q Q ′ FIXED OUTPUT MV-209 VARACTOR DIODE 2.5k CLOCK INPUT 2.5k 0.1 µF 2.2 µF 0.005 µF “SKEWED” “FIXED” 10ns TRIM 36pF† 1.82M* 6.2M* 1.1M 100k 200pF 2k* – + C1 1/2 LT1720 SKEWED OUTPUT INPUT 0V TO 2V ≈ ±10ns SKEW 2.5k* 14k 2k 12pF† 1M 1M VCC – + A1 LT1077 * 1% FILM RESISTOR ** SUMIDA CD43-100 † POLYSTYRENE, 5% = 1N4148 = 74HC04 LT1317 VIN SW 47 µF L1** VC GND FB + Figure 18. Voltage-Controlled Clock Skew |
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