Analog Wire - All Comments

RE: High speed data converter clocking for JESD204B

4714840 — Wed, 12 Jul 2017 10:27:21 GMT

Good post.Thanks for sharing.Visit www.essayguardian.com/.

RE: System trade-offs for high- and low-side current measurements

4295081 — Mon, 12 Jun 2017 23:09:54 GMT

Chee,

The current that you measure is limited by the input bias current, offset voltage, and the noise of the amplifier. The sense voltage generated across the shunt resistor should be higher than the offset voltage seen the input terminal of the amplifier. Also, the sense current should not go below the bias currents of the amplifier. Dedicated current sense amplifiers are good in measuring currents in the mA range. Having a bigger shunt resistance and a low bias and low noise amplifier will allow lower current measurements. TIA and Instrumentation Amps can measure currents in the uA/nA ranges. Measuring current in the pA range requires charge integration techniques.

RE: System trade-offs for high- and low-side current measurements

3482427 — Mon, 12 Jun 2017 22:26:15 GMT

Hi Motaz, nice article! Just curious, is there a limitation on the range of current that can be sensed using this type of single-ended or differential configuration? For instance, if I want to sense current in the pA range, would the tolerance of the sense resistor be not tight enough anymore to make an accurate current measurement? I guess any input bias current into the op amp and inaccuracy of the sense resistor will both contribute to make pA current measurement no longer possible?

RE: System trade-offs for high- and low-side current measurements

4295081 — Mon, 12 Jun 2017 05:44:39 GMT

Ahmet, ground disturbance effect the accuracy of the output voltage reading as it is referred to the load ground that is not connected through the shunt resistance. Ground disturbance is the continuous shift in the load's ground node potential due to the passing current through the shunt resistance. The higher the current passing through the resistance the higher the shift in the ground potential. Some applications can tolerate this disturbance, but if the system requires high level of accuracy ground disturbances need to be eliminated. This where high side current sensing is the preferred method to use.

RE: System trade-offs for high- and low-side current measurements

1820790 — Sun, 11 Jun 2017 00:28:59 GMT

Hello, Motaz thanks. Why do we need eleminating ground disturbances? What is ground disturbance?

RE: Inductive sensing: Should I measure L, RP or both?

3440046 — Tue, 06 Jun 2017 20:02:03 GMT

Thank you; I'm glad you found the blog helpful. For any questions regarding the LDC family, feel free to post on our forum: e2e.ti.com/.../

RE: Inductive sensing: Should I measure L, RP or both?

4997294 — Tue, 06 Jun 2017 10:54:47 GMT

Really Helpful Blog.

RE: When to use an amplifier with rail-to-rail inputs – and what to watch out for

3637877 — Tue, 09 May 2017 14:06:47 GMT

why do u put two 470pF capacitors parallel to 2.5k, What is the purpose of it?

RE: Quick fixes to common I2C headaches

3621055 — Fri, 28 Apr 2017 22:28:41 GMT

Good article. I've hit that second case (once) and it was incredibly frustrating to track the source of the instability.

RE: What you need to know about CMRR – Instrumentation amplifier topologies (Part 3)

3501540 — Wed, 26 Apr 2017 13:40:44 GMT

I think the △Vos/△Vcm should be represented by CMR , not CMRR

RE: RS-232: Use this old dog for new tricks

1479940 — Sun, 16 Apr 2017 22:47:51 GMT

We still use RS-232 to control cameras inside pipelines, with 200 metre cables, I hope it doesn't fade out. I looked into RS-485 recently, however RS-232 has always been solid, and very easy to work with.

RE: Can a clock generator act as a jitter cleaner?

582700 — Fri, 14 Apr 2017 00:51:14 GMT

Good Intro to PLL working. Can you also write an intro on measuring phase noise.

How do you decide the upper/lower frequency limits for phase noise measurement.

RE: TI resolver interface offers integration benefits in industrial drives and HEV/EV

4736143 — Wed, 12 Apr 2017 07:30:51 GMT

LoL, How do you find it?

RE: RS-232: Use this old dog for new tricks

4903502 — Wed, 12 Apr 2017 03:26:31 GMT

I'll bet it has improved noise immunity compared to USB, too. A real plus for a shop full of CNC machines.

RE: TI resolver interface offers integration benefits in industrial drives and HEV/EV

4736118 — Wed, 12 Apr 2017 01:11:31 GMT

Good job