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when you connect shunt resistor to the output port, have you check whether the DC point of the LNA is changed? have you tried to put cap in series with the shunt resistor to block the DC current?
What is the power supply and current consumption? I guess it is because your output impedance deviate from 50Ohm too much when input power is high. Do you use ADS? You can use LSSP simulation to check the input and output impedance for high power input. Before doing this, keep in mind that your...
**broken link removed**
Thanks BigBoss, here is the sketch. In fact we are investigating the architecture of the Low-IF receiver. Two options: I/Q mixer + Polyphase + IF filter. Another is I/Q mixer + Complex Filter. Low power is the main concern. I have no idea which one is better: power...
Hi xtasa,
Thanks a lot. But I still have questions.
You mean the buffer is realized by an opamp connected as a follower? Can this method be applied to a single chip receiver? In IC design, is this a practical solution? 10mA is very close to the current consumption spec of the whole receiver...
polyphase network
Low-IF receiver, mixer+polyphase filter to reject image.
Between mixer output and polyphase filter, do we need a buffer?
For low power operation, a emitter follower buffer driver has very bad linearity. How to design the buffer?
mos veff
For fix current:
1. higher current density?
2. larger device size lower current density?
3. higher Vgs less Vds?
how to test setup to fairly compare the linearity of a device?
rfde license
I have install Cadence 5141 and RFDE, the oasis license is runing well. But when I run Cadence, I can not see the link to ADS or RFDE. I think there must be some environment setup. Can anyone tell me about it?
I seems quite straight forward to install the RFDE since it has a good GUI, just click next ... next and complete, like windows application. Everything is smooth untill I start Cadence, I cannot find the link to ADS. It seems I need to modify some files before these two software are properly...
In mixer design, the RF input transistor has more concern about its linearity. When using bipolar with fixed tail current, what kind of size has better linearity?
Is a bipolar with larger emitter area has better linearity? But:
Larger emitter area --> smaller current density --> lower ft
How...
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