Enum adf4351::register::NoiseMode

pub enum NoiseMode {
    LowNoise,
    LowSpur,
}

The noise mode on the ADF4351 is controlled by setting Bits[DB30:DB29] in Register 2 (see Figure 26). The noise mode allows the user to optimize a design either for improved spurious performance or for improved phase noise performance. When the low spur mode is selected, dither is enabled. Dither randomizes the fractional quantization noise so that it resembles white noise rather than spurious noise. As a result, the part is optimized for improved spurious performance. Low spur mode is normally used for fast-locking applications when the PLL closed-loop bandwidth is wide. Wide loop bandwidth is a loop bandwidth greater than 1/10 of the RF OUT channel step resolu- tion (f RES ). A wide loop filter does not attenuate the spurs to the same level as a narrow loop bandwidth. For best noise performance, use the low noise mode option. When the low noise mode is selected, dither is disabled. This mode ensures that the charge pump operates in an optimum region for noise performance. Low noise mode is extremely useful when a narrow loop filter bandwidth is available. The synthesizer ensures extremely low noise, and the filter attenuates the spurs. Figure 10 through Figure 12 show the trade-offs in a typical W-CDMA setup for different noise and spur settings.

Variants

LowNoise

LowSpur

Trait Implementations

impl BitField<R2> for NoiseMode

fn num_bits() -> u8

Number of bits in the bit field

fn offset() -> u8

Offset from 0

fn mask() -> u32

impl Clone for NoiseMode

fn clone(&self) -> NoiseMode

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for NoiseMode

impl Debug for NoiseMode

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<u32> for NoiseMode

fn from(x: u32) -> Self

Performs the conversion.

impl Into<u32> for NoiseMode

fn into(self) -> u32

Performs the conversion.