領(lǐng)先同行MTRONPTI詳細(xì)的晶體濾波器類別

Bessel Filter 

A filter whose transfer function is derived from a Bessel Polynomial. The approximation gives a filter having a maximally flat time delay but has poor selectivity. This type of filter is close to a Gaussian filter. It has poor VSWR and loses its maximally flat delay properties at wider bandwidths.

貝塞爾濾波器
一種濾波器，其傳遞函數(shù)是從貝塞爾多項(xiàng)式導(dǎo)出的。該近似給出了具有最大平坦時間延遲但選擇性差的貼片濾波器。這種類型的濾波器接近于高斯濾波器。它具有較差的VSWR，并且在較寬的帶寬下失去其最大平坦延遲特性。

Butterworth Filter 

A filter whose transfer function offers maximally flat amplitude. Selectivity is better than Gaussian or Bessel filters but the delay and phase linearity are worse. The VSWR at center is extremely good. Butterworth filters, in most instances, are the least sensitive to changes in element values.

巴特沃斯過濾器
傳遞函數(shù)提供最大平坦振幅的濾波器。石英晶振選擇性比高斯或貝塞爾濾波器好，但延遲和相位線性較差。中心的VSWR非常好。在大多數(shù)情況下，巴特沃斯濾波器對元素值的變化最不敏感。

Chebychev Filter 

A filter whose transfer function is derived from a Checbychev equal ripple function in the passband only. These filters offer performance between that of Elliptic function filters and Butterworth filters. For the majority of applications, this is the preferred filter type as they offer improved selectivity when compared to Butterworth filters but result in simpler networks than Elliptic function filters.

切比雪夫?yàn)V波器
一種濾波器，其傳遞函數(shù)僅從通帶中的Checbychev等波紋函數(shù)導(dǎo)出。這些貼片晶振濾波器的性能介于橢圓函數(shù)濾波器和巴特沃斯濾波器之間。對于大多數(shù)應(yīng)用，這是優(yōu)選的濾波器類型，因?yàn)榕c巴特沃斯濾波器相比，它們提供了更好的選擇性，但導(dǎo)致的網(wǎng)絡(luò)比橢圓函數(shù)濾波器更簡單。

Elliptic Function Filter 

A filter whose transfer function is derived with the use of Jacobean elliptic functions. The amplitude is equal ripple in both passband and stopband. This type of filter offers the most selectivity per pole but has the worst delay and phase linear performance. These filters can sometimes be designed wider than Butterworth or Chebychev filters thereby offering reduced insertion loss.

橢圓函數(shù)濾波器
一種濾波器，其傳遞函數(shù)是用雅可比橢圓函數(shù)導(dǎo)出的。通帶和阻帶的振幅相等。這種類型的聲表濾波器提供了最高的每極選擇性，但具有最差的延遲和相位線性性能。這些濾波器有時可以設(shè)計得比Butterworth或Chebychev濾波器更寬，從而降低插入損耗。

Gaussian Filter 

A filter whose transfer function is derived from a Gaussian function. These filters have zero overshoot on the step and impulse response. Rise times and delay are the lowest of the traditional transfer functions. The response is very close to that of the Bessel filter giving poor selectivity and high sensitivity in exchange for superior delay and phase linearity.

高斯濾波器
一種濾波器，其傳遞函數(shù)是從高斯函數(shù)導(dǎo)出的。這些陶瓷濾波器在階躍和脈沖響應(yīng)上具有零過沖。上升時間和延遲是傳統(tǒng)傳遞函數(shù)中最低的。該響應(yīng)非常接近貝塞爾濾波器的響應(yīng)，給出了差的選擇性和高靈敏度以換取優(yōu)越的延遲和相位線性。