Electronic Circuit Design Ideas by V. Lakshminarayanan

By V. Lakshminarayanan

In 14 chapters masking over one hundred seventy circuits, this compendium encompasses a wide variety of circuit-design principles. each one notion involves a circuit diagram, waveforms (where applicable), and a straightforward rationalization of ways every one circuit works. in lots of instances correct layout equations and formulae also are proven, in order that the total lesson provided by way of every one could be favored. not just will this assortment be compatible for college kids in any respect degrees, however it additionally presents a prepared reference for layout engineers, consisting because it does of many circuits which are the development blocks of bigger system-design. each one part used is absolutely defined, and information sheets are supplied the place acceptable. Venkataraman Lakshminarayanan principles are usually released in magazines corresponding to ''EDN'', ''Electronic Design'', ''Electronics and instant World'' and ''Electronic Engineering''. He has additionally designed for corporations akin to Linear expertise and Maxim built-in items

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1 acts as an inverter. 1 Schematic of unit counter e 1 T Reset 7_/> /_L/< /_/ /_/ /_/ /_/ / / / / / / / / /_/ / / Common Cathode Display 7207 XTAL v 0 ICM r 22pF Hür 10M -^8-40pF Crystal G a t i n g Window _ ^ Select INPUT PROCESSING X T A L = 6 5536MHz R 1 = R 2= 50K parameters C L = 1 2 PF C M = 15mpF R s= 5 5 ^ . 2 Frequency counter Digital circuits 35 T h e I C M 7 2 0 8 is a fully i n t e g r a t e d seven decade counter-decoder-driver p r o v i d i n g the following o n - c h i p functions: a 7 d e c a d e counter, multiplexer, 7 s e g m e n t decoder, digit a n d s e g m e n t driver, plus additional logic for d i s p l a y b l a n k i n g , reset, i n p u t inhibit a n d display on/off.

E a c h translator has a linear c o m p a r a t o r input stage w i t h the positive input b r o u g h t out separately. T h e n e g a t i v e inputs of the first four c o m p a r a t o r s are tied a n in c o m m o n to V J R I P I d the n e g a t i v e inputs of the last t w o c o m p a r a t o r s are tied Interface circuits in c o m m o n to V j r i p i a n d the n e g a t i v e inputs o f the last t w o c o m p a r a t o r s are tied in c o m m o n to VTRip2With these inputs, the s w i t c h i n g point o f the c o m parators can b e set a n y w h e r e w i t h i n + the c o m m o n - m o d e r a n g e o f V~ to V - 2 V .

1 s h o w s the b a s i c circuit for b o t h u n d e r v o l t a g e detection ( M A X 8211) a n d o v e r v o l t a g e d e t e c t i o n ( M A X 8 2 1 2 ) . F o r a p p l i c a t i o n s w h e r e n o hysteresis is n e e d e d , R3 s h o u l d b e o m i t t e d . 15 V is a p p l i e d to the T H R E S H O L D pin. Design equations To e n s u r e noise-free o u t p u t s w i t c h i n g , hysteresis is frequently u s e d in v o l t a g e detectors. 15 V. R e s i s t o r R3 controls the a m o u n t o f current (positive f e e d b a c k ) s u p p l i e d from the H Y S T E R E S I S o u t p u t to the m i d point of the resistor d i v i d e r a n d h e n c e the m a g n i t u d e o f the hysteresis, or deadband.

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