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Notas de Diseño

• Descargar
  C-Load TM Op Amps Conquer Instabilities &mdash DN107
  PDF, 495 Kb, Archivo publicado: jul 1, 1995
  Extracto del documento

  C-Load Op Amps Conquer Instabilities – Design Note 107
  Kevin R. Hoskins
  Introduction
  Linear Technology Corporation has taken advantage of
  advances in process technology and circuit innovations
  to create a series of C-Loadв„ў operational amplifiers that
  are tolerant of capacitive loading, including the ultimate,
  amplifiers that remain stable driving any capacitive load.
  This series of amplifiers has a bandwidth that ranges from
  160kHz to 140MHz. These amplifiers are appropriate for
  a wide range of applications from coaxial cable drivers to
  analog-to-digital converter (ADC) input buffer/amplifiers.
  Driving ADCs
  Most contemporary ADCs incorporate a sample-and-hold
  (S/H). A typical S/H circuit is shown in Figure 1. The hold
  capacitor’s (C1) size varies with the ADC’s resolution but
  is generally in the range of 5pF to 20pF, 10pF to 30pF and
  10pF to 50pF for 8-, 10-and 12-bit ADCs, respectively. gracefully and accurately drive capacitive loads, such as
  Linear Technology’s C-Load line of monolithic amplifiers.
  Table 1 lists Linear Technology’s unconditionally stable
  voltage feedback C-Load amplifiers. Table 2 lists other
  voltage feedback C-Load amplifiers that are stable with
  loads up to 10,000pF. …

• Descargar
  LTC1560-1: Tiny 1MHz Lowpass Filter Uses No Inductors &mdash DN169
  PDF, 871 Kb, Archivo publicado: dic 1, 1997
  Extracto del documento

  LTC1560-1: Tiny 1MHz Lowpass Filter Uses No Inductors
  Design Note 169
  Nello Sevastopoulos
  The LTC В®1560-1 is a fully integrated continuous-time filter
  in an SO-8 package. It provides a 5-pole elliptic response
  with a pin selectable cutoff frequency (fC) of 1MHz or
  500kHz. Several features distinguish the LTC1560-1 from
  other commercially available high frequency, continuoustime monolithic filters: response is shown in Figure 2. In the 1MHz mode, the
  passband gain is flat up to (0.55)(fC) with a typical ripple
  of В± 0.2dB, increasing to В±0.3dB for input frequencies up to
  (0.9)(fC). The stopband attenuation is 63dB starting from
  (2.43)(fC) and remains at least 60dB for input frequencies
  up to 10MHz. 5-pole 0.5MHz/1MHz elliptic in an SO-8 package 70dB signal-to-noise ratio (SNR) measured at 0.07% THD 75dB signal-to-noise ratio (SNR) measured at 0.5% THD 60dB or more stopband attenuation No external components required other than supply and ground decoupling capacitors The elliptic transfer function of the LTC1560-1 was chosen as a compromise between selectivity and transient
  response. Figure 3a shows the 2-level eye diagram of the
  filter. The size of the “eye” opening shows that the filter is
  suitable for data communications applications. Additional
  phase equalization can be performed with the help of an
  external dual op amp and a few passive components. This
  is shown in Figure 4, where a 2nd order allpass equalizer
  is cascaded with the IC. The allpass function is achieved
  through traditional techniques, namely, passing a signal
  through a low Q inverting bandpass filter and then performing summation with the appropriate gain factors.
  Figure 3b shows the eye diagram of the equalized filter. The LTC1560-1 delivers accurate fixed cutoff frequencies of 500kHz and 1MHz without the need for internal …

• Descargar
  C-Load TM Op Amps Tame Instabilities &mdash DN83
  PDF, 929 Kb, Archivo publicado: jun 1, 1994
  Extracto del documento

  C-Load Op Amps Tame Instabilities – Design Note 83
  Richard Markell, George Feliz and William Jett
  Introduction
  By taking advantage of advances in process technology
  and innovative circuit design, Linear Technology Corporation has developed a series of C-Loadв„ў op amps which
  are tolerant of capacitive loading, including the ultimate,
  amplifiers which are stable with any capacitive load. These
  amplifiers span a range of bandwidths from 1MHz to
  140MHz. They are suited for a wide range of applications
  from coaxial cable drivers to capacitive transducer exciters.
  The Problem
  The cause of the capacitive load stability problem in most
  amplifiers is the pole formed by the load capacitance and
  the open-loop output impedance of the amplifier. This
  output pole increases the phase lag around the loop which
  reduces the phase margin of the amplifier. If the phase
  lag is great enough the amplifier will oscillate.
  External networks can be used to improve the amplifier’s
  stability with a capacitive load but have serious drawbacks.
  For instance, most designers are familiar with the use of
  a series resistor RS between the load and the amplifier
  output. The optimum value of RS depends on the load
  capacitance, so this approach isn’t useful for ill-defined …

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• Signal Conditioning > Amplifiers > Operational Amplifiers (Op Amps) > High Speed Amplifiers (GBW > 50MHz) | High Voltage Amplifiers (>12V) | Low Noise Amplifiers (