By Bob Dobkin, Jim Williams
Analog circuit and approach layout at the present time is extra crucial than ever earlier than. With the expansion of electronic structures, instant communications, complicated commercial and car platforms, designers are being challenged to improve subtle analog strategies. This finished resource publication of circuit layout ideas aids engineers with dependent and functional layout recommendations that concentrate on universal analog demanding situations. The book's in-depth software examples offer perception into circuit layout and alertness suggestions so you might follow in present day tough designs. this is often the spouse quantity to the winning Analog Circuit layout: an academic advisor to purposes and suggestions (October 2011), which has offered over 5000 copies in its the 1st 6 months of seeing that book. It extends the Linear expertise selection of software notes, which supplies analog specialists with an entire number of reference designs and challenge fixing insights to use to their very own engineering challenges.Full help package deal together with on-line assets (LTSpice). Contents contain extra software notes on strength administration, and knowledge conversion and sign conditioning circuit strategies, plus a useful circuit choice of reference designs.
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Additional resources for Analog Circuit Design Volume 2: Immersion in the Black Art of Analog Design
The place where ESR is most helpful with ceramics is low output voltage. 5V, some ESR helps the stability when ceramic output capacitors are used. Also, some ESR allows a smaller capacitor value to be used. When small signal ringing occurs with ceramics due to insufficient ESR, adding ESR or increasing the capacitor value improves the stability and reduces the ringing. Figure B1 gives some recommended values of ESR to minimize ringing caused by fast, hard current transitions. 22 FigureB1•CapacitorMinimumESR Figures B2 through B7 show the effect of ESR on the transient response of the regulator.
This is orders of magnitude larger than R7-C3, R6-C2, or the LT1070’s 40kHz commutation rate. As a result, C1 dominates the loop. 13’s occur1. Although C1’s decay time constant is long, its charge time constant is short because the circuit has low sourc-ing impedance. This accounts for the ramp nature of the oscillations. Increased loading reduces the C1 load decay time constant. 16’s plot reflects this. As loading increases, the loop oscillates at a higher frequency due to C1’s decreased decay time.
Like any feedback circuit, frequency compensation is needed to make it stable. For the LT1963A, the frequency compensation is both internal and external – the output capacitor. The size of the output capacitor, the type of the output capacitor, and the ESR of the particular output capacitor all affect the stability. In addition to stability, the output capacitor also affects the high frequency transient response. The regulator loop has finite bandwidth. For high frequency transient loads recovery from a transient is a combination of the output capacitor and the bandwidth of the regulator.