Ll Lee

7 Questions 12 Answers 0 Followers

Questions related from Ll Lee

How small can a 915 MHz RFID antenna (for tag, not reader)be?

For example, the antenna in this paper is very small. Can it be even smaller (such as

28 July 2020 8,825 8 View

Is there any commercial mems stress sensor chip ?

I had found some literature that develops MEMS stress sensor (CMOS, N-MOS, P-MOS). However, I can't find commercial solutions for this type of sensor. Is there any replacement? (Stress...

22 May 2020 6,437 6 View

Strange problem in rf to dc rectifier?

The circuit is a voltage doubler, the diodes are sms7630. The reverse breakdown voltage of sms7630 is 2V. In ADS simulation, the output voltage never exceeds 2V. However, in practice, I can get...

19 December 2019 4,118 4 View

How to block the current but release it when the voltage reach certain value?

I am working on rf energy harvesting. Now, a problem occurs. Breifly describe the circuit. Antenna--Rectifying circuit--Storage capacitor-- DC-DC converter--Load. Now, it seems that the UVLO...

16 June 2019 3,151 11 View

Can somebody help me with haramonic analyze of a rectifier in ADS?

I am designing a rectifier for rf energy harvesting . I am trying to use haramonic analysis to find out the input impedance of the rectifier at 91MHz, 10dbm. But I am a beginner and there is no...

05 April 2019 3,080 4 View

Why a single wire can work as dipole antenna?

The model of the dipole antenna consists of a source and two separated wires. The electrons flow alternatively in the wires, generating electromagnetic waves. However, in practice, I found that...

01 January 1970 5,354 5 View

How to eliminate the Radio Frequency Interference using RFI filter at the input of instrumentation amplifier?

A typical wheastone bridge consists of 4 resistor is amplified by a instrumentation amplifier and an ADC reads the output value. It is required to work under the exposure of UHF signal (900MHz...

01 January 1970 9,944 3 View