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EE 435 Lect 40 Spring 2010

EE 435 Lect 40 Spring 2010 - EE 435 Lecture 40 References...

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Unformatted text preview: EE 435 Lecture 40 References Clocked Comparator V DACk Φ 1 Φ 1 Φ 2A C 1 V IN V OUT Preamplifier with offset compensation and regenerative latch V DACk Φ 1 Φ 1 Φ 2A C 1 V IN V OUT Gain of preamplifier may still not be large enough .• •• • • Review from last lecture .• •• • • ADC Types • Flash • Pipeline • Two-Step Flash • Multi-Step Flash • Cyclic (algorithmic) • Successive Approximation • Folded • Dual Slope • Single-bit • Multi-bit • First-order • Higher-order • Continuous-time Nyquist Rate Over-Sampled All have comparable conversion rates Basic approach in all is very similar .• •• • • Review from last lecture .• •• • • Pipelined ADC Stage k DAC k ADC k A k d k n k X INk X OUTk S/H k C LK + V REF Pipeline Stage .• •• • • Review from last lecture .• •• • • Pipelined ADC Stage k DAC k ADC k A k d k n k X INk X OUTk S/H k C LK + V REF Pipeline Stage Usually Realized as Single SC Block .• •• • • Review from last lecture .• •• • • 1-bit/Stage Pipeline Implementation C 1 C 2 Φ 1 Φ 1 Φ 1 Φ 2 V IN Φ 2 ●d k Φ 2 ●d k 2 V REF 2 V REF − V OUT 2 2 REF IN IN O REF IN IN V 2V V V V 2V V + < = − > DAC k 2 V OUTk S/H k C LK + V REF V INk d k .• •• • • Review from last lecture .• •• • • V BIAS V REF Voltage Reference Circuit V REF Voltage Reference .• •• • • Review from last lecture .• •• • • Current Reference V BIAS I REF Current Reference Circuit I REF .• •• • • Review from last lecture .• •• • • Desired Properties of References V BIAS V REF Voltage Reference Circuit • Accurate • Temperature Stable • Time Stable • Insensitive to V BIAS • Low Output Impedance (voltage reference) • Floating • Small Area • Low Power Dissipation • Process Tolerant • Process Transportable .• •• • • Review from last lecture .• •• • • Consider Voltage References V BIAS V REF Voltage Reference Circuit V DD V REF M 2 M 1 2 1 1 2 2 1 1 2 1 1 L W L W L W L W V V V T DD REF + − − = V DD ,V T reference Observation – Variables with units Volts needed to build any voltage reference .• •• • • Review from last lecture .• •• • • Voltage References V BIAS V REF Voltage Reference Circuit Observation – Variables with units Volts needed to build any voltage reference What variables available in a process have units volts? V DD , V T , V BE (diode) ,V Z ,V BE ,V t ??? What variables which have units volts satisfy the desired properties of a voltage reference?...
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EE 435 Lect 40 Spring 2010 - EE 435 Lecture 40 References...

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