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1、1/?Capacitors?and?resistors?have?parasitic?inductance,?about?0.4nH?for?surface?mount?and?4nH?for?a?leaded?component.?2/?If?you?don"t?want?a?high?bandwidth?transistor?to?oscillate?place?lossy?components?in?at?least?2?of?the?3?leads.?Ferrite?beads?work?well.?3/?When?taking?DC?me
2、asurements?in?a?circuit?and?they?don"t?make?sense,?suspect?that?something?is?oscillating.?4/?Opamps?will?often?oscillate?when?driving?capacitive?loads.?5/?The?base-emitter?voltage?Vbe?of?a?small?signal?transistor?is?about?0.65v?and?drops?about?2mV/deg?C.?Vbe?goes?down?with?inc
3、reasing?temp.6/?Multiply?0.13nV?by?the?square?root?of?the?ohmic?value?of?a?resistor?to?find?the?noise?in?a?1Hz?bandwidth.?Then?multiply?by?the?square?root?of?the?BW?in?Hz?gives?the?total?noise?voltage.?7/?Johnson?noise?current?goes?down?with?a?increase?in?resistance.8/?The?imp
4、edance?looking?into?the?emitter?of?a?transistor?at?room?temp?is?26Ohm/Ie?in?mA?9/?All?amplifiers?are?differential?in?that?they?are?referenced?to?ground?somewhere.?10/?Typical?metal?film?resistor?has?a?temp?coef?of?about?100?ppm/deg?C?11/?The?input?noise?voltage?of?a?quiet?op?a
5、mp?is?1nv/sqrt(Hz)?but?there?are?plenty?available?with?20nV/sqrt(Hz).?Op?amps?with?bipolar?front-ends?have?lower?voltage?noise?and?higher?current?noise?than?those?with?FET?front-ends?12/?Using?an?LC?circuit?as?a?power?supply?filter?can?actually?multiply?the?power?supply?noise?
6、at?the?filter"s?resonant?frequency.?Use?inductor?with?low?Q?to?overcome?this.?13/?Use?comparators?for?comparing?and?op?amps?for?amplifying?and?don"t?even?think?of?mixing?the?two.?14/?Ceramic?caps?with?any?other?dielectric?other?than?NPO?should?only?be?used?for?bypass?applicati
7、ons.?15/?An?N-channel?enhancement-mode?FET?needs?+ve?voltage?on?the?gate-source?to?conduct?form?drain-source.?16/?Small?signal?JFETS?work?very?well?as?low-leakage?diodes?by?connecting?drain?&?source?together?in?log?current-to-voltage?converters?and?low?leakage?input?protection
8、.?Small?signal?bipolars?with?b-c?tied?together?will?also?make
