HSPICE power consumption is avg power?

[Boki]

Dear All,

HSPICE power consumption is avg power?

Is that correct for any circuits?

Best regards,
Boki.

 

[Joel Kolstad]

Boki <bokiteam@ms21.hinet.net> wrote:

HSPICE power consumption is avg power?

More like RMS power. Are you doing a DC analysis?

 

[Kevin Aylward]

Joel Kolstad wrote:

Boki <bokiteam@ms21.hinet.net> wrote:
HSPICE power consumption is avg power?

More like RMS power. Are you doing a DC analysis?

Ho humm.. there is no such thing as rms power. i.e. the square root of
the mean of the power waveform squared. Its a meaningless number. The
average power is the actual "real" power, i.e. the heating power
dissipated.

Average power is calculated by Vrms.Irms for sine waves. Hence, the
misnomer in incorrectly naming it rms power. Usually, most know that
"rms power" *really* means average power so this poor terminology is not
usually a problem, but your answer above post implies that this point
has not been understood. It is claiming that there is a usefull object
called rms power separate from average power. There isn't.

Kevin Aylward
salesEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.

 

[boki]

"Joel Kolstad" <JKolstad71HatesSpam@Yahoo.Com> wrote in message news:<c93330$a3f$1@news.oregonstate.edu>...

Boki <bokiteam@ms21.hinet.net> wrote:
HSPICE power consumption is avg power?

More like RMS power. Are you doing a DC analysis?

ya, .tran analysis, there are switches and switched-opamps in my
circuits, but whatever the clock turn on the switched-opamp or not,
the power consumption still the same and not as my calculate.

 

[Joel Kolstad]

boki <bokiteam@ms21.hinet.net> wrote:

ya, .tran analysis, there are switches and switched-opamps in my
circuits, but whatever the clock turn on the switched-opamp or not,
the power consumption still the same and not as my calculate.

Hmm... that is odd... plotting the voltage source waveforms looks OK, eh?

Thanks to Kevin for pointing out that there isn't really such a thing as
'RMS power,' I'm not quite sure what I was thing. Maybe there's just 'real
power' and 'wrong power.'

 

[boki]

Dear Kevin,

My circuit is switched-capacitor switched-opamp sigma-delta
modulator, my opamp will be turn on and off between clocks, in such
kind of circuits the power calacution in spice still correct?

I am confusing, because I whatever I always turn on the opamp or run
circuit in switch status, I still get same power consumption, what
should I do@@

Best regards,
Boki.


"Kevin Aylward" <kevin.aylwardEXTRACT@anasoft.co.uk> wrote in message news:<d6gtc.20648$Pz2.18500@pathologist.blueyonder.net>...

Joel Kolstad wrote:
Boki <bokiteam@ms21.hinet.net> wrote:
HSPICE power consumption is avg power?

More like RMS power. Are you doing a DC analysis?

Ho humm.. there is no such thing as rms power. i.e. the square root of
the mean of the power waveform squared. Its a meaningless number. The
average power is the actual "real" power, i.e. the heating power
dissipated.

Average power is calculated by Vrms.Irms for sine waves. Hence, the
misnomer in incorrectly naming it rms power. Usually, most know that
"rms power" *really* means average power so this poor terminology is not
usually a problem, but your answer above post implies that this point
has not been understood. It is claiming that there is a usefull object
called rms power separate from average power. There isn't.

Kevin Aylward
salesEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.