- Rf circuit design software serial#
- Rf circuit design software software#
- Rf circuit design software Pc#
Rf circuit design software software#
Demodulation is more common problem for analogue circuits, but can produce more catastrophic effects in digital circuits (when software gets corrupted).Įven slow opamps will happily demodulate interference up to cellphone frequencies and beyond, as shown by the real product test results of Figure 4. Opamps are very sensitive to RF interference on all their pins, regardless of the feedback schemes employed (see Figure 3).Īll semiconductors demodulate RF. Most of the immunity problems with analogue devices are caused by RF demodulation. Some care for the real needs of their customers, and may help tip the balance when making a purchasing decision. Manufacturers of sensitive or high-speed analogue parts (and data converters) often publish EMC or signal-to-noise application notes for circuit design and/or PCB layout.
Rf circuit design software serial#
It is important to control these issues by design, testing, or purchasing to ensure continuing compliance in serial manufacture, and some suitable techniques were described earlier (section on choosing digital ICs). Specifications and standards for immunity testing of ICs are being developed, and in the future it may be possible to buy ICs which have EMC specifications on their data sheets.ĭifferent batches, second-sourced, or mask-shrunk analogue ICs can have significantly different EMC performance for both emissions and immunity. But as a general rule for low emissions in high-frequency analogue circuits: slew rates, voltage swings, and output drive current capability should be selected for the minimum necessary to achieve the function (given device and circuit tolerances, temperature, etc.).īut the biggest problem for most analogue ICs in low-frequency applications is their susceptibility to demodulating radio frequency signals which are outside their linear band of operation, and there are few if any data sheet specifications which can act as a guide for this. 1.2 Analogue components and circuit design 1.2.1 Choosing analogue componentsĬhoosing analogue components for EMC is not as straightforward as for digital because of the greater variety of output waveshapes. Steve Furber’s group at UMIST) will dramatically reduce the total amount of emissions and also achieve a true spread-spectrum instead of concentrating emissions at narrow clock harmonics. Asynchronous logic techniques (such as the AMULET microprocessors being developed by Prof. Most of the problems with emissions from digital circuits are due to synchronous clocking. Spread-spectrum clocking should not be used for timing-critical communications links, such as Ethernet, Fibre channel, FDDI, ATM, SONET, and ADSL.
Rf circuit design software Pc#
Debate continues about the possible effects of spread-spectrum clocking on complex digital ICs with the suppliers claiming no problems and some pundits still urging caution, but at least one major manufacturer of high-quality PC motherboards is using this technique as standard on new products.