Latch and isolation circuit

A latch, comprising:

• a first-level substructure;
• and
• at least one second-level substructure, the number of the at least one second-level substructure being k, and k being a positive integer greater than or equal to 1;
• wherein the first-level substructure comprises:
• a first load having a first terminal coupled with a first port;
• a second load having a first terminal coupled with the first port;
• a first driving circuit having a control terminal coupled with a second terminal of the first load and a second terminal coupled with a second port;
• and
• a second driving circuit having a control terminal coupled with a second terminal of the second load and a second terminal coupled with the second port;
• and
• wherein each of the at least one second-level substructure comprises:
• a third load, a fourth load, a third driving circuit and a fourth driving circuit;
• wherein in a first second-level substructure, a first terminal of the third load is coupled with the second terminal of the second load, a second terminal of the third load is coupled with a control terminal of the third driving circuit, a first terminal of the first driving circuit and a first terminal of the fourth driving circuit, a first terminal of the fourth load is coupled with the second terminal of the first load, a second terminal of the fourth load is coupled with a control terminal of the fourth driving circuit, a first terminal of the second driving circuit and a first terminal of the third driving circuit, and a second terminal of the third driving circuit and a second terminal of the fourth driving circuit are coupled with a first reference port;
• and
• wherein in an i-th second-level substructure, a first terminal of the third load is coupled with a second terminal of the fourth load of an (i−1)-th second-level substructure, a second terminal of the third load is coupled with a control terminal of the third driving circuit, a first terminal of the third driving circuit of the (i−1)-th second-level substructure and a first terminal of the fourth driving circuit, a first terminal of the fourth load is coupled with a second terminal of the third load of the (i−1)-th second-level substructure, a second terminal of the fourth load is coupled with a control terminal of the fourth driving circuit, a first terminal of the fourth driving circuit of the (i−1)-th second-level substructure and a first terminal of the third driving circuit, and a second terminal of the third driving circuit and a second terminal of the fourth driving circuit are coupled with an i-th reference port;
• wherein i is a positive integer greater than 1 and less than or equal to k.