4 ms·
No the ADC use resistors to measure voltage, resistors turn electric energy into thermal energy, they literally use how much time it takes to dissipate electric
by SigmundA 5y ago
No the ADC use resistors to measure voltage, resistors turn electric energy into thermal energy, they literally use how much time it takes to dissipate electricity as heat to measure voltage.
I know someone who needs to read up on antennas and digital receivers and its not me.
- ncmncm 5y ago
- gus_massa 5y ago> they literally use how much time it takes to dissipate electricity as heat to measure voltage. I never heard that, and looking at the list in https://en.wikipedia.org/wiki/Analog-to-digital_converter#Types https://en.wikipedia.org/wiki/Analog-to-digital_converter#Ty... I can't find any that work this way.
- ncmncm 5y agoRight, none has ever worked that way. Radio receivers do not depend on an analog to digital converter, or even a resistor, to extract a signal from an antenna. The essential component is a diode. (That is not to say that, having detected, amplified, and demodulated an antenna signal, the result won't finally drive an A/D converter; you can drive anything you want to after all that. Even a speaker. But operation of the speaker, too, does not depend in any way on heat.)
- SigmundA 5y agoDigital receivers which are in cellphones are most certainly based on A/D convertors which is what you originally referenced. All captured antenna energy is dissipated as heat through resistance in order to extract useful information and convert it into the digital domain. Even in a analog receiver the power amplifiers used to drive a speaker or whatever are going to dissipate the signals power as heat in order to modulate the amplifiers output power (out power will always be less than power supply power). If you are talking about a crystal radio, then yes the input power drives a speaker and is turned into sound instead (along with some power lost heat in the circuits resistance).
- SigmundA 5y ago> The Wilkinson ADC is based on the comparison of an input voltage with that produced by a charging capacitor. The capacitor is allowed to charge until a comparator determines it matches the input voltage. Then, the capacitor is discharged linearly. The time required to discharge the capacitor is proportional to the amplitude of the input voltage. While the capacitor is discharging, pulses from a high-frequency oscillator clock are counted by a register. The number of clock pulses recorded in the register is also proportional to the input voltage. The capacitor is discharged using a resistor of known value. Also take it down to the comparator level which basically all ADC use the op-amps use transistors and resistors and are themselves dissipating the input power in order to measure voltage. The word transistor is a contraction of transfer resistance, they are electronically variable resistors and as everyone knows dissipate power as heat during function.
- ncmncm 5y ago
- SigmundA 5y ago
- ncmncm 5y agoI guess my degree in electrical engineering was a waste of time. In no reference to electronics of radio reception, anywhere in the world, will you find even a single formula or equation with a reference to a change in temperature of a component being involved in detecting a signal. Period. None anywhere. No exceptions. Also, nowhere in any reference on the operation of a cell phone will you find so much as a single analog-to-digital converter attached to its microwave antenna. Nowhere. Not one. No exceptions. Your profound and aggressive ignorance is on display for all to see, and recorded for posterity.
- jeffbee 5y ago> I guess my degree in electrical engineering was a waste of time. That much is abundantly clear.